Thirty-five Staphylococcus isolates from dogs infected with pyoderma or otitis externa were evaluated to establish their sensitivity against 33 antibiotics, based on the sensitivity of cephalexin. Cephalexin susceptible isolates were found in 26 isolates (74%) of the 35. Nine resistant isolates were considered to be multiple drug resistant Staphylococcus as these isolates were only susceptible to imipenem, fosfomycin, doxycyclin, minocycline, amikacin and vancomysin.

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A 10-year-old, castrated male, mix-breed cat was presented with systemic desquamation and alopecia accompanied by emaciation. Blood tests, serum T4 level, ACTH stimulation test, feline TLI, feline pancreatic lipase, FeLV antigen, FIV antibody, antinuclear antibody, and X-ray of the chest, abdomen and extremities revealed no abnormalities. Histopathological findings showed lymphocytic infiltration in the superficial dermis and also in the epidermis and follicular epithelium. The cat was treated with cyclosporine and hydrolyzed chicken diet instead of previous chicken dry diet. Those treatments failed, and then salmon was provided as a home cooked diet. Dramatic improvement of the skin lesions was immediately obtained. This case was diagnosed as chicken-related lymphocytic mural folliculitis. However, the cat suddenly died from respiratory failure one week later. Autopsy showed no significant abnormalities except suppurative pleuropneumonia.

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A 6-year-old, castrated male Shiba-inu displayed a mass showing invasive growth in the external auditory canal of the left ear. Histologically, the tumor mass predominantly comprised spindle-shaped neoplastic cells, arranged in solid nests admixed with irregular tubulo-acinar structures, lined by cuboidal to polygonal neoplastic cells. Neoplastic cells had extensively infiltrated into deep tissues. No bone formation or chondroid matrix was observed in the tumor stroma. Both types of neoplastic cells showed nuclear atypia and high mitotic activities. Luminal epithelial elements were immunohistochemically positive for pan-cytokeratin and cytokeratin 8. Spindle-shaped cells showed intense immunoreactivity for vimentin, pan-cytokeratin and α-smooth muscle actin, indicating that spindle-shaped cells retained the original histological characteristics of myoepithelial cells. These findings were consistent with a diagnosis of ceruminous gland carcinoma with malignant proliferation of acinar epithelial and myoepithelial tumor cells, which rarely occurs in dogs. Following resection with wide surgical margins, no recurrence or metastases have been observed as of 6 months postoperatively.

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