Breed-related disease: The Rottweiler
John K. Rosembert The Rottweiler is a breed of domestic dog regarded as medium-to-large, or large. The dogs were known in German as Rottweiler Metzgerhund, meaning Rottweil butchers’ dogs, because they are descends from dogs used by the Romans to drive the herds that fed the army as it marched through Europe. Along the way, the Roman dogs bred with local dogs, and in the town of Rottweil, the result was strong dogs used by butchers to drive cattle to market. On the way home, the dogs served as protection, guarding the butcher’s proceeds from robbers. Rottweilers are slightly longer than tall, large dogs, ranging in height from 22 inches for a small female to 27 inches for a large male. They are blocky dogs with massive heads. Ears lie fairly tight to the head, hanging down somewhat. Muzzles are square and strong, but Rottweilers can be a bit drooly because of loose flews (lips). Rottweilers should always be black with tan points, and the ideal coat is quite short, dense, and a bit harsh. The Rottweiler breed often gets a bad reputation. You’ve probably heard — in one way or another — that Rotties can be incredibly aggressive, downright mean, and off-putting to other people. While these traits can certainly be true, and are perhaps a bit worse when it comes with a dog powerful enough to do damage, these traits don’t apply to most Rottweilers. The personality of every dog depends on their upbringing, how they were bred, and the personality of their parents. These ‘bad’personalities often come from poorly bred puppies that didn’t experience proper socialization. The true personality of a Rottweiler, and what they were bred to be, is a mixture of the loyal, steadfast watchdog, and the incredibly homebody. Also, despite popular belief, the Rottweiler loving is actually one of the most intelligent dog breeds in existence . As both an independent and intelligent breed, the Rottweiler requires an experienced hand for control, letting a dominant-minded dog run unchecked within the family can lead to many negative behaviors. Apart from these traits, it’s important to realize that there can be quite a lot of variation in the personality of Rottweiler’s, Some tend to be natural entertainers who love to play, while others may be much more reserved and calm. Besides, even with their dominant temperament, this breed is vulnerable to several diseases, here are some of the most common diseases related to this breed. Bloat : Gastric dilatation volvulus, also known as GDV or bloat, usually occurs in dogs with deep, narrow chests. This means the Rott is more at risk than other breeds. When a dog bloats, the stomach twists on itself and fills with gas. When a dog bloats, the stomach twists on itself and fills with gas. The twisting cuts off the blood supply to the stomach and sometimes to the spleen. Left untreated, the disease is quickly fatal, sometimes in as little as half an hour. Bone and Joint Problems : A number of different musculoskeletal problems have been reported in Rottweilers. While it may seem overwhelming, each condition can be diagnosed and treated to prevent undue pain and suffering. With diligent observation at home and knowledge about the diseases that may affect your friend’s bones, joints, or muscles, you will be able to take great care of him throughout his life. Neurologic Problems : Several neurologic diseases can afflict Rottweilers. Symptoms of neurological problems can include seizures, imbalance, tremors, weakness, or excessive sleeping. Hip dysplasia: Rottweilers are one of the breeds most affected by hip dysplasia, a genetic deformity in which the head of the femur doesn’t fit properly into the hip socket. This condition can range from mild to severe. Severe cases are extremely painful and often require surgery to correct. Even with the surgery, the dog is likely to develop arthritis as he ages. Inflammatory Bowel Disease : Inflammatory bowel disease, or IBD, is an immune system disorder common in Rotts in which the intestinal lining becomes overrun with immune system cells called lymphocytes and plasmacytes. The stomach and/or intestinal lining becomes thickened affecting his ability to absorb nutrients properly. Chronic vomiting or diarrhea is common, or symptoms may flare up suddenly and then improve again for a time. Stress, diet change, or intestinal parasites can make IBD worse. Sources: http://www.vetstreet.com/dogs/rottweiler#overview https://www.harlingenveterinaryclinic.com/services/dogs/breeds/rottweiler# Photo credit: https://en.wikipedia.org/wiki/Rottweiler https://www.goldenacresdogs.com/guard-dogs-rottweiler.html
Breed-related disease: American Bobtail
John K. Rosembert The American Bobtail is an uncommon breed of domestic cat which was developed in the late 1960s, which descends from a short-tailed kitten acquired by a couple John and Brenda Sanders during a vacation to Arizona. It is a medium to large, semi-cobby cat. Their sturdy bone structure and well-developed musculature, along with their broad chest and slightly arched back (due to longer hind than front legs), give them the appearance of a small Lynx. Their head is broad with prominent cheeks and a strong chin, and a triangular-shaped muzzle a little wider than it is long. Their eyes are big and slightly almond-shaped. Their ears, which are average sized and sit quite low on the skull, each have a small tuft of fur at the end known as “Lynx tips”. The variety with mid-length fur also have tufts of fur between the toes. The American Bobtail is devoted to family, and is very easily trained to walk on a leash. This cat breed enjoys playing with interactive cat toys, other cats, and children. The American Bobtail makes for an ideal family companion. This is a smart cat who enjoys puzzle toys, learning tricks, and playing fetch. He isn’t as vocal as some breeds, but he communicates his pleasure with chirps, clicks and trills, as well as the standard purr and meow. The American Bobtail has an adaptable nature, so he’s a good traveler. Long-distance truckers and travelers find him to be an excellent companion. The cats have also found a niche with some psychotherapists because of their loving and intuitive nature. That same adaptability and kindness makes him a good family companion and suited to a variety of lifestyles, from relaxed to rowdy. American Bobtails are generally healthy cats with no predispositions to inherited health conditions, however that doesn’t mean that every American Bobtail will never experience health problems, it’s important to note: American Bobtails with no tail may experience: Spinal Problems: The American Bobtail may be prone to spinal problem due to their short spine. Polycystic kidney disease (PKD): A condition characterized by the development of cysts on one or both kidneys. Hypertrophic cardiomyopathy: Which is the thickening of the heart muscle. Hip Dysplasia: This is rare in domestic cats, and is common in purebred cats. This occurs when the hip joint is loose, and leads to degenerative joint disease. (osteoarthritis) Symptoms include lameness that can be mild to severe. Cats generally need no surgery for hip dysplasia. Weight reduction can help reduce discomfort. Source: https://petonbed.com/american-bobtail/ https://www.thesprucepets.com/american-bobtail-full-profile-history-and-care-4705973 Photo credit: https://cattime.com/cat-breeds/american-bobtail-cats
Breed-related disease: Dachshund
The dachshund originated in Germany as a hunting dog. Though its origins can be traced as far back as the 15th century, the breed’s development really began in 17th century Germany. Called dachshunds, which translates as “badger dogs,” these short hounds did just that—they hunted badgers. Their short legs, loose skin, big chests, determination, and independence were ideal for digging, entering tunnels, and of course, fighting badgers. Their flap-down ears help keep dirt and debris out when burrowing. The Dachshund comes in three coat varieties and two sizes. The original Dachshunds were smooth coated and arose from crosses of the Bracke, a miniature French pointer, with the Pinscher. They’re all short with cute stubby legs, but Dachshunds actually come in three sizes: standard, miniature, and kaninchen (“rabbit” in German). A full grown standard Dachshund averages 15-28 lbs. while the miniature typically weighs less than 11 lbs. The kaninchen usually weighs around 8-10 lbs. The word “icon” is terribly overworked, but the Dachshund—with his unmistakable long-backed body, little legs, and big personality—is truly an icon of purebred dogdom, Dachshunds aren’t built for distance running, leaping, or strenuous swimming, but otherwise these tireless hounds are game for anything. Smart and vigilant, with a big-dog bark, they make fine watchdogs. Bred to be an independent hunter of dangerous prey, they can be brave to the point of rashness, and a bit stubborn, but their endearing nature and unique look has won millions of hearts the world over. Dachshunds, as with every BREED, have certain health issues that occur more frequently within their “genetic pool. In this article we’ll mention some of the most common health issues that are very prone to Dachshunds Dachshund Stomach Issues: it is not uncommon for Dachshund’s to experience stomach issues. Some are merely sensitive to certain foods or abrupt food changes. Others can suffer from gastroenteritis, a term referring to stomach issues resulting in inflammation of the gastrointestinal tract. Dachshunds tend to be more prone to developing hemorrhagic gastroenteritis. Liver Disease: Dachshunds are more likely than most breeds to have a liver disorder called portosystemic shunt (PSS). This is a hereditary condition in which the liver can’t effectively remove toxins from the bloodstream, Surgery is sometimes needed, but many times you can treat it with medication and a special diet. Cancer/ tumor : Dachshunds have a higher than average risk of developing cancers of the skin, fat cells, and anal sacs, this includes a particular risk of developing mast cell tumors and squamous cell carcinoma. Dachshunds have an increased risk of getting cancer. Eye Problems: Dachshunds are prone to several different eye problems. Some are extremely painful; others can cause blindness if not treated right away. Cataracts and glaucoma are common eye issues that Dachshunds may experience. Glaucoma is a very painful disease that can lead to blindness if not treated, while Cataracts are more common in older Dachshunds and can cause blindness, but surgery can restore sight in some cases. Intervertebral disk disease: conditions severe enough for hind-end paralysis are so common that Dachshunds are one of the breeds most likely to spend part of their lives in “canine wheelchairs”: wheeled carts that support the rear of the dogs. Because of their long, low-slung spines, normal canine behavior like jumping off the sofa may result in a slipped, pinched, herniated or ruptured disc Diabetes mellitus: which is caused by the failure of the pancreas to regulate blood sugar, diagnosed by the presence of the typical clinical signs (excess thirst, excess urination, excess appetite, and weight loss), a persistently high level of glucose in the blood, and the presence of glucose in the urine. Diabetes is the only common disease that will cause the blood glucose level to rise substantially in dogs. Sources: http://www.vetstreet.com/dogs/dachshund#health https://formydachshund.com/11-of-the-most-common-health-issues-in-dachshunds/ https://en.wikipedia.org/wiki/Dachshund Dachshund
Breed-related disease: Ragdolls
In the family of cat breeds, Ragdolls are among the younger siblings. The cats were first developed by breeder Ann Baker who wanted to develop a beautiful cat with a loving, gentle personality, and she started with domestic longhairs of unknown ancestry. Josephine, the foundation cat, was white with Siamese-type markings, and in her genes she carried a seal mitted or black tuxedo pattern. The Ragdolls of today descend from Josephine and her son, Daddy Warbucks, as well as other unknown domestic longhair males. The Cat Fanciers Association began registering Ragdolls in 1993, and they achieved championship status in 2000. Ragdolls are sometimes nicknamed “puppy cats” because of the way they follow their people from room to room, sometimes even taking your privacy from the bathroom. Unlike many cats, Ragdolls are notable for collapsing into the arms of anyone who holds them, even if they are cradled on their back. They love their people, greeting them at the door, following them around the house, and leaping into a lap or snuggling in bed whenever given the chance. They often learn to come when called or to retrieve toys that are thrown for them. All cats have the potential to develop genetic health problems, both pedigreed cats and mixed-breed cats have varying incidences of health problems that may be genetic in nature. Problems that may affect the Ragdoll include the following: Hypertrophic cardiomyopathy : which is a condition in which a portion of the heart becomes thickened without an obvious cause. This results in the heart being less able to pump blood effectively. Symptoms vary from none to feeling tired, leg swelling, and shortness of breath and even sudden death. Blood clots: Ragdolls can be susceptible to blood clots in the arteries. Symptoms include difficulty breathing, loss of appetite, lethargy and depression. Some cats may also faint. Treatment is available, but it is imperative to see a vet as soon as these symptoms appear. Dilated and restricted cardiomyopathy : Dilated cardiomyopathy is caused by the dilation of the heart muscles. Restricted cardiomyopathy is caused by weakened elasticity of the heart muscles. Both can be fatal and need to be detected and treated as soon as possible. Sources: http://www.vetstreet.com/cats/ragdoll#health https://cattime.com/cat-breeds/ragdoll-cats#/slide/1 https://bowwowinsurance.com.au/cats/cat-breeds/ragdoll/
Breed-related disease: Poodle
Poodles are believed to have originated in Germany, though they have been known as French dogs for many years. Their name is derived from the German word pudel, meaning “to splash in water.” Standard poodles are considered the oldest form of this breed. Their history of use as retrievers and water dogs led to the well-known poodle haircut, which was designed to protect joints from cold water temperatures. The breed share a square outline, with a long, elegant neck and a straight back. The tail is docked, but not short, so it can wave gaily. Poodles tend to have a leggy appearance and a long muzzle combined with dropped ears. They move with a springy, lively gait. The coat of the poodle is its crowning glory. Dogs competing in the breed ring must have a specific clip, with areas of extravagant hair coupled with skin tight clipping, these clips actually developed for a reason: they provided thick coat over the joints and chest to keep the dog warm while working in cold water. Intelligent, loving, loyal, and mischievous are four words Poodle enthusiasts commonly use to describe the breed’s personality. Poodles are among the smartest of breeds, but that intelligence can translate into stubbornness. Even so, they can make wonderful therapy dogs. Their empathetic nature and joy in engaging with people make them naturals for visiting with people in nursing homes, hospitals, and schools . Poodles are active dogs, but the smaller dogs need less room and less exercise. Toy and Miniature Poodles are often the companions of people who are less active and can be extremely happy as lap dogs and TV-watching buddies. Just be sure their busy minds have enough to keep them out of mischief. Poodles love to learn and want to please. Trick-training suits their heritage as circus dogs quite well. Teach them to pick up the newspaper, carry a bottle to the recycling bin, and bring your slippers . All dogs have the potential to develop genetic health problems, just as all people have the potential to inherit a particular disease, Poodles are generally considered to be a very sturdy breed with few health issues. Addison’s Disease : Also known as hypoadrenocorticism, this extremely serious condition is caused by an insufficient production of adrenal hormones by the adrenal gland. Most dogs with Addison’s disease vomit, have a poor appetite, and lethargy. Because these signs are vague and can be mistaken for other conditions, it’s easy to miss this disease as a diagnosis until it reaches more advanced stages. Gastric Dilatation-Volvulus : Commonly called bloat, which occurs when gas gets trapped inside a dog’s stomach. The stomach twists as much as 180 degrees, stopping the flow of digestion and causing the gas to build up pressure. It’s an incredibly painful disorder with a 20% mortality rate even with surgical intervention. Deep-chested breeds like the standard Poodle or Great Dane are especially prone to experiencing bloat. Hip Dysplasia : A dog’s hip operates on a ball-and-socket joint. When the socket is over- or under-developed, or when the ligaments holding the two together are weak, the ball can become dislodged. This constant dislocation and relocation will wear down the joint’s integrity and cause hip dysplasia. Hypothyroidism: Hypothyroidism is caused by an under active thyroid gland. It’s thought to be responsible for conditions such as epilepsy, hair loss, obesity, lethargy, hyperpigmentation, pyoderma and other skin conditions. Epileptic : Epileptic seizures in dogs are as shocking for canines as they are for humans. Dogs will often seem confused or panicked about what’s happening, and the sight of your dog seizing can be terrifying to watch. When this happens, you need to remain calm and focus on helping your dog. https://dogtime.com/dog-breeds/poodle#/slide/1 https://en.wikipedia.org/wiki/Poodle
A Review on Feline Calicivirus
Maigan Espinili Maruquin Structure and Replication The Caliciviruses are small, non-enveloped, positive strand RNA viruses which infects a wide range of hosts (Sosnovtsev and Green 2003), which, in cats, feline calicivirus- (FCV) is associated with upper respiratory tract infections (Gaskell, R. M., 1985). The FCV is a naked and icosaedral virus, 30–40 nm in diameter (Carter MJ, Madeley CR, 1987). The single protein capsid is 65- 66 kDa (Neill, Reardon et al. 1991, Carter, Milton et al. 1992), having a single-stranded positive- sense RNA genome of 7.7 kb (Carter, Milton et al. 1992). Having 3 ORFs, the ORF1 encodes a 200 kDa polyprotein to be processed into six mature non-structural proteins (Di Martino, Marsilio et al. 2007). Whereas, the ORF2, which is divided into six regions (A, B, C, D, E, and F), encodes a 73 kDa capsid precursor (preVP1) which undergoes rapid proteolytic cleavage during the maturation process, yielding a mature 60 kDa capsid protein (VP1) (Carter 1989, Carter, Milton et al. 1992, Sosnovtsev, Sosnovtseva et al. 1998, Sosnovtsev and Green 2003, Di Martino, Marsilio et al. 2007, Prikhodko, Sandoval-Jaime et al. 2014). The E-region is responsible for antigenic properties of the FCV virion (Guiver, Littler et al. 1992, Milton, Turner et al. 1992, Seal, Ridpath et al. 1993, Tohya, Yokoyama et al. 1997, Prikhodko, Sandoval-Jaime et al. 2014) and is also responsible to the protruding (P) subdomain P2 on the virion surface (Chen, Neill et al. 2006, Ossiboff, Zhou et al. 2010, Prikhodko, Sandoval-Jaime et al. 2014). Finally, the ORF3, encodes a small minor structural protein, 12 kDa, with 106 amino acids, VP2, and is essential for the production of infectious virions (Sosnovtsev, Belliot et al. 2005, Di Martino, Marsilio et al. 2007). The replication of FCV includes a plus-sense genomic RNA of approximately 7.7 kb, and a subgenomic RNA of 2.4 kb (Herbert, Brierley et al. 1996, Sosnovtsev and Green 2003) Fig. 01. The Feline Calicivirus Source: https://www.123rf.com/photo_29482486_feline-calicivirus-capsid-causes-a-viral-disease-in-cats-a-vaccine-exists-atomic-level-structure-.html Epidemiology The FCV has originally been isolated from the gastrointestinal tract of cats in New Zealand (Fastier 1957, Pesavento, Chang et al. 2008). High viral prevalence in a population has been explained by long-term shedders (Hurley, Pesavento et al. 2004), sequential infections and episodes of reinfection (Coyne, Gaskell et al. 2007, Pesavento, Chang et al. 2008). With the features of FCV: high genetic variability, a capacity to persist in infected individuals, stability in the environment, and ubiquity in feline populations worldwide are causing the severity of the disease (Pesavento, Chang et al. 2008). Humans are not susceptible to FCV (Radford, Addie et al. 2009). Cats may also shed from 30 days to years even after recovery (Wardley 1976). The FCV infection is widespread among cat populations, having a report of 25–40% from colonies and shelters (Wardley, Gaskell et al. 1974, Bannasch and Foley 2005, Helps, Lait et al. 2005, Radford, Addie et al. 2009). Pathogenesis / Clinical Signs The FCV enters via nasal, oral or conjunctival routes wherein oropharynx is the primary site of replication. At 3 to 4 days of post infection, transient viraemia occurs and can be detected in many other tissues. Epithelial necrosis occurs while vesicles develop into ulcers, which is usually in the margin of the tongue. Neutrophils infiltrate the dermis of other tissues; and it takes 2 to 3 weeks to start healing (Gaskell RM, 2006) (Radford, Coyne et al. 2007, Radford, Addie et al. 2009). a. Oral and Upper Respiratory Tract Disease Mostly in kittens, incubation period takes 2–10 days. oral ulceration, sneezing and serous nasal discharge start to appear (Gaskell RM, 2006) (Radford, Addie et al. 2009). In some severe cases, pneumonia occurs, pulmonary lesions occur more rarely, dyspnoea, coughing, fever and depression, can occur, particularly in young kittens (Radford, Coyne et al. 2007, Radford, Addie et al. 2009). b. FCV-associated Lameness There could be lesions in the joints of cats with acute synovitis, consists with thickening of the synovial membrane and an increase in quantity of synovial fluid (Dawson, Bennett et al. 1994, Radford, Coyne et al. 2007). Fever could be observed following FCV infection and vaccination, usually a few days or weeks after the acute oral or respiratory signs (Pedersen NC, 1983) (Radford, Addie et al. 2009). c. Virulent systemic FCV disease (VSD) The virulent systemic FCV disease is manifested by systemic inflammatory response syndrome, disseminated intra – vascular coagulation, multi- organ failure and death, with mortality rates of up to 67% (Foley, Hurley et al. 2006, Radford, Addie et al. 2009). During VSD, virus infiltrates cellular compartments not normally associated with FCV; lesions are widespread with ulceration of the skin, broncho-interstitial pneumonia and necrosis in the liver, spleen and pancreas (Pedersen, Elliott et al. 2000, Pesavento, Maclachlan et al. 2004, Radford, Coyne et al. 2007). The FCV evolves to be efficiently transmitted among the cat population (Radford, Coyne et al. 2007). Clinical signs initially appear as a severe acute upper respiratory tract disease. Lesions, ulcers and alopecia are observed on the nose, lips and ears, around the eyes and on the footpads (Radford, Addie et al. 2009). d. Molecular pathogenesis Cytopathic effect is observed in infected cells, with cell rounding and membrane blebbing (Knowles J.O, 1988), which leads to inhibition of cellular protein synthesis (shut-off) (Willcocks, Carter et al. 2004) and may stop translation of cellular mRNAs to focus on the viral VpG-bound RNA (Radford, Coyne et al. 2007). It has been identified that the junctional adhesion molecule-1 (JAM-1) serves as a cellular receptor for FCV in cell culture (Makino, Shimojima et al. 2006). Diagnosis Nucleic acid can be detected in conjunctival and oral swabs, blood, skin scrapings and lung tissue using conventional, nested and real-time reverse-transcriptase PCR (RT-PCR) assays. Molecular assays are validated in a large panel of strains to minimize false-negative results. The use of reverse transcriptase PCR allows unique virus strains detection (Abd-Eldaim, Potgieter et al. 2005, Radford, Addie et al. 2009). The presence of replicating virus can be isolated from nasal, conjunctival and oropharyngeal swabs, depending
Canine blood-typing
Canine blood-typing Andy Pachikerl, Ph.D Introduction: Dog erythrocyte antigens are responsible for initiating approximately 70% to 80% of immune-mediated transfusion reactions in the dog. As with other species, the red blood cell antigens found in the dog have various immunogenicities. In health, these antigens are participants in cell recognition-self versus nonself. In disease, they may serve as antigens for antibody or markers in disease occurrence. Little is known about their biochemical properties. Currently their description is reliant on polyclonal antibody serology. This reliance has limited the progress of transfusion practice in the dog. Historically, the study of canine blood groups and their importance in transfusion began in the 1600s through a physician, Richard Lower. He is credited with the first canine-to-canine transfusion. The efforts of doctors Lower and Denis in heterologous transfusion using lamb, dog, and human subjects introduced the basic transfusion premise “like transfuses like.” In 1910, Von Dungem and Hirszfeld documented the presence of four hemolysins and agglutinins based on canine alloimmunization (Swisher & Young, 1961). Further work by Ottenburg, Kaliski, and Friedman in 1913 confirmed these findings. From 1937 to 1949, Wright, Whipple, and Eyquem further defined the presence of six canine blood groups (Colling & Saison, 1980). However, not until 1961 was the importance of these antigens in transfusion and disease investigated by Swisher, Young, and Trabold (Swisher, et al., 1962). To date, the work submitted by Swisher and Young remains the most current published information of the importance of canine blood groups in transfusion (Swisher, 1954; Swisher, et al., 1962; Young, et al., 1951). Additional blood groups have been identified by Rubenstein (1968), Suzuki/5 Colling and Saison (Colling & Saison, 1980; Colling & Saison, 1980), and Symons and BelLl9 (Symons & Bell, 1992). Of this latter group, only the antigen first noted by Rubenstein (Colling & Saison, 1980) was evaluated in regard to transfusion significance by Bull (Bull, 1976). The importance of canine blood groups in veterinary transfusion medicine is based on three factors: the incidence of the antigen in the dog population, the incidence of naturally occurring antibody within the population, and the effect of the antibody against the antigen in vivo. Current blood typing schemes identify six erythrocyte antigens with possible importance. The dog erythrocyte system Blood groups are defined by glycolipids and glycoproteins on the surface of the red blood cell membrane. Current blood typing schemes identify six dog erythrocyte antigens (DEAs): 1.1, 1.2, 3, 4, 5, and 7 (Table 1). Blood groups are independently inherited. Simple Mendelian laws of dominance govern their inheritance. These antigens are defined by using polyclonal antibodies generated through canine alloimmunization. Polyclonal antibody recognition may be dependent on multiple recognition sites to define the “antigens” currently accepted. Biochemically, little is known about the DEA system. Table 1. Dog erythrocyte antigens established as international standards: classification, occurrence, and significance This blood group system has been defined with multiple alleles. They include the antigens 1.1, 1.2, 1.3, and a null type. An individual dog may show only one of the four phenotypes. Family studies suggest a Mendelian type of autosomal dominance. Table 2 describes the current phenotypic and genotypic information on this blood group system. 1.1- and 1.2-positive dogs have been studied for transfusion significance. Naturally occurring antibody to these alleles has not yet been found. Therefore, first-time transfusion reactions do not occur. However, if a negative dog is exposed to 1.1- positive erythrocytes, a strong hemolysin can result. On second exposure, an immune-mediated hemolytic transfusion reaction results causing removal of transfused cells in less than 12 hours. Hemoglobinuria and hyperbilirubinemia frequently occur. In addition to uncross matched, untyped transfusion, pregnancy can cause production of antibody against DEA 1.1 25% of the time. For these reasons 1.1-positive dogs are excluded as transfusion donors. 1.2-positive dogs can cause a problem as both the transfusion donor and recipient. A previously sensitized negative type dog undergoes permanent red blood cell removal and loss 12 to 24 hours after the administration of 1.2-positive red blood cells. Thus, 1.2-positive dogs are poor erythrocyte donors. If a 1.2-positive dog is sensitized with DEA 1.1 red blood cells, it will produce a potent anti-DEA 1.1 antibody. Administration of DEA 1.1 red blood cells to a sensitized 1.2 dog results in an immediate hemolytic transfusion reaction. Therefore, 1.2-positive dogs are at risk after sensitization for immediate transfusion. 1.3-positive dogs have not been evaluated for transfusion significance. Future study is limited because of the unavailability of typing sera for DEA 1.3. DEA 7 This red blood cell antigen is the most controversial among the six antigens discussed. Published reports of naturally occurring antibody to this antigen suggest that this antibody has a natural prevalence as high as 50% in DEA 7-negative dogs. Recent reports by Giger fail to support the presence of naturally occurring anti-DEA 7. Observations by the author suggest that naturally occurring antibody does exist in 20% to 50% of all DEA 7-negative dogs. However, the naturally occurring antibody is quite weak, rarely producing a titter greater than 1:8. In the presence of naturally occurring antibody, as in the cat, immunemediated transfusion reaction can occur during a first transfusion. Sensitized DEA 7-negative dogs, when transfused with DEA 7-positive erythrocytes show a delayed transfusion reaction. Hemolysis does not occur; however, an irreversible sequestration and loss of red blood cells occurs in 72 hours. This type of delayed transfusion reaction is only significant if the regenerative ability of the transfusion recipient is compromised. Because of the presence of naturally occurring antibody in the DEA 7-negative population and because of the delayed loss of erythrocytes in sensitized dogs, DEA 7-positive dogs are not recommended as donors. DEA3 This antigen has not been considered significant because of its low incidence in the dog population of the United States. However, recent evaluation of DEA type by breed suggests that it may be more important. Only 6% of the general population has DEA 3-positive cells. Yet 23% of the Greyhounds typed from 1990 to