Tail chasing in a Bull Terrier
Dodman, N.H.; Bronson, R.; Gliatto, J.
Journal of the American Veterinary Medical Association 202(5): 758-760
1993
ISSN/ISBN: 0003-1488 PMID: 8454509 Document Number: 197
A Bull Terrier that was continuously chasing its tail was examined clinically, electroencephalographically, and by computed tomography of the head. The dog was also given test treatments with an anticonvulsant (diazepam) and a pure opioid antagonist (naloxone). The dog appeared to be hysterical and dissociated from its surroundings. Electroencephalography revealed a seizure pattern that was most marked over the temporal lobe, and computed tomography revealed mild hydrocephalus. Diazepam effectively controlled tail chasing, whereas naloxone did not. The dog was discharged on anticonvulsant therapy but subsequently had to be euthanatized when aggression developed. Results of examination and treatment have led the investigators to propose a hereditary mechanism for tail chasing, perhaps related to zinc malabsorption. Further studies are needed to confirm the cause of seizure-related tail chasing and aggression in Bull Terriers and an effective antiepileptic drug regimen has yet to be devised. The case described, however, provides some framework from which to work and, hopefully, will direct veterinarians to investigate seizures as a possible cause of tail chasing in Bull Terriers in the future and to plan treatment regimens accordingly.
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