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Identifying a food allergy in dogs requires an elimination diet trial — and that trial is only as clean as what goes into your dog's mouth. Purina Pro Plan Veterinary Diet HA (Hydrolyzed) uses a single, hydrolyzed protein source processed to a molecular weight below the threshold that triggers most food allergic immune reactions.
For elimination trials: HA must be the only food given for 8–12 weeks. This includes treats, dental chews, flavoured medications, and table scraps — any cross-contamination invalidates the trial.