Need a bit of advice,cousin of mine has a 6mth old lurcher bitch pup ,he bought the the pup when it was 5mth and was told it had to be fed a hypoallergenic diet,so cus bought hpa dog food, now the problem is he has to feed the pup 4 small meals a day,if he tries to up its food to a normal feeding routine the dog gets the runs apart from that the pup is in great condition any ideas why this is happening