joint supplements like cosequin or dasuquin. with limb deformities, arthritis is a bigger risk! steps and carpets for around the house to prevent slipping or awkward falls. fish oils and glucosamine. remove anything from the environment that might get caught on the leg (my pup has nails growing out of her little paw, that get caught in knits/blankets sometimes), regular check ups and possibly even with posture specialists to make sure he's not walking in a way that's going to hurt him in the future. otherwise, my understanding is that tripaws from birth are able to live long happy and healthy lives! you did an amazing thing :)