To identify a food allergy, it's often recommended to conduct an elimination diet. This involves feeding your dog a limited ingredient diet that excludes common allergens for several weeks and then gradually reintroducing other foods to see if any cause a reaction.
If you suspect your dog has a food allergy, it's best to consult with a veterinarian for proper diagnosis and management. They can help you find a suitable diet that meets your dog's nutritional needs while avoiding allergens.
Remember to always introduce new foods gradually and monitor your dog for any adverse reactions.
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