Common skin diseases (CSD) were compared and discussed in 1,407 dogs, 178 cats, and 24,657 human patients in dermatology services in approximately 6 years. CSDs shared by both dogs and humans were seborrheic dermatitis, atopic dermatitis, and scabies, and CSDs shared by both cats and humans were dermatitis and dermatophytosis. On the other hand, human CSDs not shared by dogs and cats were contact dermatitis, viral infections, and nevus. Although the terminology, definitions, and general concepts of skin diseases are not quite unified, the value of comparative dermatology, particularly in the abovementioned diseases was indicated.

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Eosinophil-rich cutaneous pyogranulomas occurred in two adult horses. Lesions included papules, plaques, and nodules over the face, neck, brisket, and shoulder. Many lesions showed surface alopecia, crusting, and hyperkeratosis. Some lesions had purulent discharge, and some seemed pruritic or painful. Histopathological findings included diffuse eosinophilic granulomatous dermatitis with multifocal areas of necrosis and neutrophil accumulation. Tissue cultures grew coagulase-positive staphylococci. Treatment with trimethoprim-sulfamethazole (4 weeks) and dexamethasone (5 days) was curative.

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Serum allergen-specific immunoglobulin E (IgE) test using high affinity IgE receptor (ALLERCEPT) and intradermal skin test (IDST) against Dermatophagoides farinae (Df) were compared in 143 dogs with pruritic behavior. When over 400 units were evaluated as high IgE level, the sensitivity to IDST was 95.8%. Although the specificity was 72.3%, it increased to 85.5% when dogs with possible false negative IDST were excluded. Then, ALLERCEPT against Df was evaluated in 50 dogs with classic canine atopic dermatitis (cAD) and 151 non-cAD dogs with pruritic behavior. The sensitivity was 98% and specificity was 80.8% on cAD with the same cut-off (400 units). Based on these results, it is suggested that ALLERCEPT against Df could be an alternative to IDST, and the assay could identify a characteristic of cAD, which is commonly associated with IgE.

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