I have a 4 month old Great Pyr/German Shepherd mix. He got his last set of puppy shots this week and the vet thinks he might be mildly allergic to chicken. I give him all he can eat for 30 minutes 4x a day and he usually picks at it/is a really slow eater.

Does anyone have any suggestions on a poultry free puppy food?
How big do you think he will get if hes 50lbs at 17 weeks?

Link to his current food: