Pros: Relieved skin and foods allergies AND my dog stopped having seizures.
Cons: The price of the food is expensive. Benefits greatly outweighed the additional cost.
My 14 y/o yorkie had bad skin and food allergies. Her food allergies were bad enough for us to end up at the Emergency Clinic during the night, more than once for vomiting after she'd been given some "table food" by well meaning relatives. She also had severe seizures.
We started her on Prescription Diet Z/D Ultra and stopped all other foods and treats. Her allergies were much improved and a bonus benefit was her seizures eventually stopped altogether.