Flea allergy dermatitis is the most common skin disease in dogs in many countries, causing intense pruritus from hypersensitivity to flea saliva in affected animals.
Flea allergy dermatitis causes extreme pruritus that significantly compromises quality of life. Dogs with FAD may scratch, chew, and rub affected areas almost continuously, causing self-trauma, hair loss, and skin damage. The constant discomfort prevents normal rest, play, and social interaction. Secondary infections from self-trauma cause additional pain and may require antibiotic treatment. The suffering is entirely preventable with consistent flea control - dogs on year-round prevention effectively never experience flea allergy attacks. The welfare case for consistent preventative treatment is clear and straightforward: preventing the allergic trigger prevents all associated suffering. Many dogs with FAD can be managed with flea prevention alone, without needing allergy medications, making this one of the most cost-effective welfare interventions in veterinary medicine.