I posted this in another thread about a pit limping so I'm going to copy / paste it here in case it helps you see it:
Our dog was limping but not because of a specific incident. She was under 1 year old, so it was concerning. After some vet visits and an xray, it was diagnosed to be a genetic hip / joint issue. The limp was so bad at one point that I would sometimes notice her descending stairs on 3 legs with 1 leg rescinded. Part of the treatment was change in diet from Pro Plan puppy to a food with main ingredient salmon. We also spoiled her with a can of canned salmon once a week. She didn't like the salmon based dog food at first, but she eventually started eating it. Eventually she stopped eating well, but she would eat her friends' food which was meat flavored. So we had to mix in meat flavored food with the salmon flavored to get her to eat well. The supplements recommended were - Condrox and Artrifin. I've done research and these are basically human health supplements manufactured in central america with glucosamine y chondroitin. Being human medicine, they are relatively expensive, but we noticed when we backed off too heavily, the limp started coming back ever so slightly. We also reduced exercise and other typical similar recommendations from the vet, but due to the combined factors, she experienced a great recovery and went from consistently limping with pain into what appears to be a complete and pain free existence. After more research into human leg injury recovery, I found that many athletes are recommended to take glucosamine sulfate as part of a supplement regimenyt. There are massive benefits including relieving joint pain and slowing joint degeneration, two major benefits to any dog limping from a limb injury. But glucosamine is slow to act, so you might not see much results / improvement until after a month or more of treatment. That said, I would recommend to anyone with a limping dog to highly consider rotating their diet across food brands or main ingredients (chicken, lamb, beef, bison, duck, etc) and maybe mixing in a different higher quality ingredient treats made from fish or an ingredient with nutritional diversity to their main food source to cover some potential nutrition deficiencies. Also glucosamine and chondroitin supplements are available in many dog products like little treats you give once a day or as a concentrated liquid form. I'm not sure how recommended it would be, but what worked for me and could work for others, is try giving them human supplements like was prescribed to my pit in Costa Rica where we did not have access to pet marketed supplements. I'm not sure what the equivalent of Condrox and Artrifin are where you live, but my impression is they were something like Arthritis medication. I couldn't find the exact formula for Condrox but Artrifin looks to be little more than glucosamine and chondroitin. If your dog has a specific injury from something like wrestling, glucosamine supplements can only help the body recover from a nutrition perspective whereas a dog with poor nutrition / food quality might have a more difficult recovery for a leg injury.