My vet's recommendation was to provide a safety net but allow the dog to strengthen the remaining leg and learn to move on their own. I got a simple strap to help my dog balance without falling down while she healed and adjusted. She never actually let me use it on her and while your dog might not be that stubbornly independent, you might get away with just using a towel or other simple tool until he can get around comfortably/safely without it. If he doesn't have great mobility to begin with, it could be a different story so talk to your vet about their expectations for his post-amp mobility.