Oclacitinib is primarily used in veterinary medicine to treat allergic dermatitis and atopic dermatitis in dogs. It works by inhibiting specific enzymes involved in the inflammatory response, which helps to reduce itching and skin inflammation. This makes it effective in providing relief from symptoms associated with allergic reactions, improving the quality of life for affected animals. It is typically administered orally and is known for its rapid action, often showing improvement within a short period after the first dose. Regular use can help manage chronic skin conditions in dogs, making it a valuable tool for pet owners and veterinarians in managing these common dermatological issues.