Anyone feed fromm? Was giving prancer blue buffalo grain free puppy. Vet doesn't approve saying tht in his practice this has been causing lots of bladder stones n kidney stones.. so tired to petsmart they recommended grain free puppy simply nourish....His stools are horrible...not sticking wth tht. Local pet store recommended fromm grain free ....worried about protein content...do I need to worry when he is puppy...or not till older.. worried about kidneys...I'm a worry wart. ..I want him to hve the best chance for a long healthy life.