I have heard of the 1 year change over guideline too,so I would finish the bag of food you have and look for an adult one he likes. I would stop giving him so many treats-sounds like they are filling him up without maybe being helpful nutritionally. Give him some Nutristat each day-it increased my pup's apetite. You could give small pieces of cooked chicken, liver and cheese at training treats/rewards. My pup also gets a raw chicken neck in the evening. She is thin too- I understand your anxiety. They can be hard to feed!
__________________ Sandra J and Holly |