Idiosyncrasies in greyhounds that can affect their medical care - Veterinary Medicine
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Idiosyncrasies in greyhounds that can affect their medical care
These athletes have been bred for speed and an even temper. But some irregularities in greyhounds will affect how to clinically assess and treat these dogs. Make sure you're prepared for the next greyhound that visits your practice.


VETERINARY MEDICINE


Anesthetic agents

Greyhounds have lower hepatic clearance of thiobarbiturates than nongreyhounds, which results in prolonged recoveries after repeated doses of the drug. Complete recovery in these cases may take up to eight hours, compared with one or two hours in nongreyhounds. Many anesthesiologists think that a single injection of a thiobarbiturate will not be harmful to a greyhound,29 but I think that too many other safer anesthetics are available to justify its use.

A ketamine-diazepam combination and propofol are the two most commonly used injectable anesthetic protocols (tiletamine/zolazepam is an alternative to ketamine and diazepam but anecdotally seems to result in rougher recoveries).26 As with any breed, premedication to decrease stress and pain will result in less stressful recoveries. Lower doses of acepromazine should be used in greyhounds (< 0.1 mg/kg), as greyhounds appear to be more sensitive to acepromazine's effects, which can prolong sedation and worsen hypothermia.29 Acepromazine is usually administered intramuscularly with an opioid. Maintaining anesthesia with isoflurane or sevoflurane is preferred because they are metabolized to a lesser degree than halothane or methoxyflurane, though halothane is considered acceptable. Halothane is more well-known for triggering malignant hyperthermia than isoflurane or sevoflurane.

CONCLUSION

Greyhounds have many idiosyncrasies that can affect their medical care. Being aware of these idiosyncrasies will prevent misdiagnoses and allow for more appropriate treatment and diagnostic testing. Many studies are pending publication that will describe additional idiosyncrasies. For those veterinarians interested in learning more about greyhounds and interacting with other veterinarians who also work with greyhounds, please visit the Greyhound Health Research and Information Network Web site at http://www.ghrin.org/.

ACKNOWLEDGMENTS

Special thanks to Dr. Richard Bednarski, Dr. Walter Threlfall, Dr. Lori Hitchcock, Dr. Guillermo Couto, and Dr. Suzanne Stack for their help in writing this article.

William E. Feeman III, DVM
Animal Medical Centre of Medina
1060 S. Court St.
Medina, OH 44256

REFERENCES

1. Sullivan PS, Evans HL, McDonald TP. Platelet concentration and hemoglobin function in greyhounds. J Am Vet Med Assoc 1994;205:838-841.

2. Porter JA Jr, Canaday WR Jr. Hematologic values in mongrel and greyhound dogs being screened for research use. J Am Vet Med Assoc 1971;159:1603-1606.

3. Steiss JE, Brewer WG, Welles E, et al. Hematologic and serum biochemical reference values in retired greyhounds. Compend Contin Educ Pract Vet 2000;22:243-248.

4. Iazbik MC, Couto CG. Morphologic characterization of specific granules in Greyhound eosinophils. Vet Clin Pathol 2005;34:140-143.

5. Feeman WE 3rd, Couto CG, Gray TL. Serum creatinine concentrations in retired racing Greyhounds. Vet Clin Pathol 2003;32:40-42.

6. Wynn SG, Bartges J, Dodds WJ. AAVN Nutrition Research Symposium, June 2003 (abst).

7. Gaughan KR, Bruyette DS. Thyroid function testing in Greyhounds. Am J Vet Res 2001;62:1130-1133.

8. Wolf D. Medical information you need to know about Greyhounds. Philadelphia, Pa: National Greyhound Adoption Program.

9. Schoning PR, Cowan LA. Bald thigh syndrome of Greyhound dogs: gross and microscopic findings. Vet Dermatol 2000;11:49-51.

10. Hitchcock L, Ohio Veterinary Cardiology Ltd, Akron, Ohio: Personal communication, 2005.

11. Kittleson MD, Kienle RD. Signalment, history, and physical examination. In: Small animal cardiovascular medicine. St. Louis, Mo: Mosby, 1998;44-46.


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