My wife and I will be picking up our 8 week old Boerboel, Saturday 30th. I have been researching the best puppy food for him. I am open for suggestions. I have zeroed in on Fromm puppy food for large breeds. Our vet said not to go for grain-free food because studies have shown that a grain-free diet might cause heart conditions. Any truth to that? Fromm has two puppy foods for large breeds, one is grain-free and one has grain.