Wow! Thats sad! I feed kibble and the protein level is from 34% and up. My one dog has arthritis in her back hip joint and its hereditary. The vet didnt say it had anything at all to do with protien levels in foods. So this is news to me about the protien level in the food being involved. And I feed all 4 dogs and only one has it. My chocolate lab. she was not putting wieght on her one leg. Shes on gluchosimine chondrotine with msm 1000mg daily, fish oil, vit E, and tramadol. also I have recovery sa which I do give my 8 year old yellow lab! Shes doing great now! Oh and she has lost appx. 15 lbs. wnet from 88 lbs. to 73. This has also helped tremendously. She needs to loose a few more and we are at a plateau!