Excessive Hunger Dog. If your dog’s increased hunger coincides with the addition or modification of a medication, talk to your vet about your suspicions. Cushing's syndrome is a possibility in older dogs.
It is important to differentiate polyphagia caused by a diseased state from that caused by psychological reasons. It may be caused by disorders in the systems that regulate appetite and blood sugar or by conditions such as pregnancy. Does prednisone cause fast breathing in dogs?