[Samoan81]

My guess is the food…like chicken some dogs respond the same way to lamb. Lamb tends to cause skin allergies and yeasty ears…that’s my experience with it.
Protein levels are a bit low …whats the fat%…cal%—its also a Diamond Product..known for recalls. I would switch imo
Most important thing right now is for him not to gorge into food.
Remember fleas have a 28 day cycle…would use capstar to make sure. then a preventative.
Have you read up on satin balls for weight gain?
Have you tried bitter apple on his paws? Does he have chew toys accessible?