>I am worried that chappie wont have enough nutrients etc in for a growing pup.
I had a Border Collie pup with similar problems, and gut damage. I felt so guilty that I wasn't giving him puppy food, and imagined that I would have all sorts of problems.
Tinned Chappie doesn't give him any upsets, his coat is almost like burnished copper (he's a red) and I would say to you that Chappie is superb for these types of problems. He is now 6 years old, and the vet always comments on his superb condition.