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Food allergies in cats are almost always a reaction to the proteins in their diet — specifically, whole intact proteins that the immune system has learned to attack. Purina Pro Plan Veterinary Diet HA (Hydrolyzed) for cats solves this by starting with a single protein source (soy) and breaking it down into pieces too small for the immune system to recognise.
Note: For an elimination diet trial to be diagnostic, HA must be the only food your cat receives for 8–12 weeks — including treats, table scraps, and flavoured medications.