Hi!
I rescued Sam in February from a neglectful home. The previous owner was feeding him Pro Plan puppy. He said that it reduced the volume of poop. When I asked about his weight and why he was so skinny, he said that he can't figure it out, but the vet had checked him for worms and there was no problem and that he was just a skinny puppy. I did get the vet records and they had done two wormings, both negative. I had another done when I got him, also negative. Sam is 10 months now. He was 25 inches and 52 pounds when we got him. Every rib and his hips, spine and shoulder blades stuck out. My dachshund has been on Nutro since I took her off puppy food. She is gorgeous and healthy, if I do say so myself. After doing some research and talking with other dog owners, since I am to lazy to BARF, I put Sam on a combination of Nutro Natural Puppy and High Energy/Performance (it is in the orange bag). Sam is thriving. He is slowly adding weight. He is now almost 27 inches and 62 pounds. He is still thin, but not emaciated. Our obedience instructor has noticed a remarkable difference. The vet, who essentially told me not to feed Nutro (mostly because Nutro doesn't give kickbacks and incentives), remarked how gorgeous he is looking when we had him in for his neuter last week. He did drop a pound or two from surgery, but he is getting it back. I prefer the Nutro products because they do not use any chemical preservatives and they do not use by-products. Sam also gets some yogurt in his evening meal and some canned pumpkin in his morning meal. Good luck with your boy! Give him some time if he doesn't take to the new food right away. Always introduce a new food slowly. Start by adding about 20% new food to the old food for 3-4 days, if he doesn't develop diarrhea, etc then increase to 40% new food and continue until you are giving all new food. If there are any signs of diarrhea or stomach upset, then back up a step and continue a few days longer and then try again. Good luck!