my dog has degenerative myleopathy. He has a hard time standing or walking for any period of time. Would a leg brace help him si

It's difficult to say without knowing the details of his condition. However, if there is spinal involvement which their normally is, the added weight of a leg brace would only stress the back more. Consequently, something that relieves the stress on his back and legs would seem more appropriate than just a leg brace.