Flea infestations cause significant welfare suffering in cats through pruritis, skin disease, anaemia in kittens, and flea allergy dermatitis, and effective prevention is straightforward when understood.
Flea infestation causes acute and chronic welfare suffering through intense pruritis driving constant scratching, skin trauma from self-directed grooming, and in sensitised cats with FAD, severe dermatitis from even occasional flea contact. Heavy infestations in kittens cause lethargy, pale mucous membranes, and life-threatening anaemia. Many owners underestimate the welfare impact of flea infestation, attributing scratching to normal behaviour. Effective flea control requires treating both the animal (killing adult fleas) and the household environment (disrupting the 95 percent of the population that lives off the host). The most common reason for treatment failure is incomplete household treatment combined with inconsistent monthly application of on-pet products.