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  • Author or Editor: Robert W. Dunstan x
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Objective—

To determine the response rate of zinc-responsive dermatosis to zinc supplementation, the optimal dosage of zinc required for resolution of lesions, the rate of recurrence of lesions, and to develop recommendations for maintenance dosages of zinc to be administered to dogs with this type of zinc-responsive dermatosis.

Design—

Retrospective case series.

Animals—

17 northern-breed dogs with a diagnosis of zinc-responsive dermatosis.

Procedure—

Histologic evaluation of skin biopsy specimens and review of medical records. Additional information was obtained from veterinarians and owners via a telephone questionnaire.

Results—

In 12 of 17 dogs, lesions were unilateral initially, then became symmetrical as the disease progressed. Pyoderma was evident in 5 of 17 dogs, whereas 10 were pruritic. Most lesions initially developed between September and April, and 12 of 17 dogs developed lesions in February, October, and November. Initial dosages of zinc supplement ranged from 0.8 to 4.6 mg/kg of body weight/d (0.36 to 2.09 mg/lb/d). Effective/maintenance dosages ranged from 0.5 mg/kg (0.23 mg/lb), twice weekly, to 8.0 mg/kg/d (3.6 mg/lb/d). Fifteen of 17 dogs had complete resolution of lesions after zinc supplementation. Lesions recurred in 9 of 16 dogs. Approximately half of the recurrent lesions were a result of a missed dose or a decrease in dosage or frequency of zinc supplementation.

Clinical Implications—

An initial dosage of zinc supplement of 1.0 mg of elemental zinc/kg (0.45 mg of elemental zinc/lb), PO, every 24 hours is recommended. Treatment should be continued for 1 month to determine response to treatment, and the daily dosage should be increased by 50% if the initial dosage is not effective. Dogs are prone to recurrence of lesions if a dose of zinc is missed or the dosage or frequency is decreased. (J Am Vet Med Assoc 1997;211:451–453)

Free access
in Journal of the American Veterinary Medical Association

Summary

Clinical and histologic features of seasonal flank alopecia in 12 Airedale Terriers and 12 Boxers were reviewed. Most of the affected dogs were spayed females; however, sexually intact females as well as sexually intact and neutered male dogs with the disease were identified. Mean (±sd) age of onset was 3.6 ± 2.4 years.

Free access
in Journal of the American Veterinary Medical Association
in Journal of the American Veterinary Medical Association
in Journal of the American Veterinary Medical Association
in Journal of the American Veterinary Medical Association

Abstract

Objective—To determine whether systemic immunologic hyperreactivity exists in horses with chronic laminitis, compared with responses for nonlaminitic horses.

Animals—7 nonlaminitic horses and 7 CL horses.

Procedure—In experiment 1, intradermal testing (IDT) was performed on 7 nonlaminitic and 7 CL horses to evaluate the response to a combination of 70 allergens at 15 and 30 minutes and 4 and 24 hours after injection. Three nonlaminitic and 3 CL horses used in experiment 1 were used in experiment 2 to determine whether histologic differences existed between the 2 groups. The H&E-stained tissue sections were evaluated on the basis of 3 criteria. For all analyses, 2-sample t-tests were used to determine significant differences between the groups.

Results—In experiment 1, CL horses had significantly higher total responses to IDT than nonlaminitic horses at the first 3 time periods. Also, CL horses had significantly fewer total scores of 0 than nonlaminitic horses at all time periods, except at 24 hours. In experiment 2, we did not detect significant differences between groups for any criterion.

Conclusions and Clinical Relevance—Results support the hypothesis that CL horses develop hyperreactivity to various antigenic stimuli, compared with responses for nonlaminitic horses. Therefore, the possibility that antigenic challenge may result in exacerbation of clinical signs of laminitis should be discussed with horse owners. Chronic laminitis should also be a consideration when a horse becomes lame following antigenic challenges. (Am J Vet Res 2003;64:279–283)

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in American Journal of Veterinary Research