My German Shepherd suffered from arthritis in his declining years, it's a common problem in the breed. I put him on a meal supplement which included glucosamine, chondroitin and MSM. It helped.
No. I have a young puppy, he is only 10 months old.
My daughter's dog is also young but has some issue but it is neurological. He does not feel pain like he should. I forget what she said the vet can do about it.