Food allergies and intolerances in dogs cause chronic skin and gastrointestinal disease that significantly impairs quality of life until the causative ingredient is identified and eliminated.
Food allergy causes chronic, intense pruritus — a maddening itch that dogs cannot escape or adequately scratch. Constant scratching, paw-licking, and ear-shaking disrupt sleep, social interaction, and quality of life profoundly. Secondary skin infections from self-trauma add pain to the chronic discomfort. The diagnostic process — a strict 8-12 week elimination trial requiring total dietary control — is challenging for owners and can feel endless for suffering dogs. However, the resolution once allergens are identified is often complete and permanent, making the investigative investment enormously worthwhile. The key welfare failure is dogs managed long-term with symptomatic treatments (steroids, oclacitinib) without pursuing allergen identification that could eliminate the problem entirely.