Salmon oil or coconut oil ill give couple times a week if i remember too. Theres sosmething in tinned tomatoes that fights lactic acid build up ive used it myself but only really had trouble with certain dogs that wasnt fit and id overdone it with them. Garlics a good supplement but too much isnt good for dogs. Indont think dogs need supplements if there on a good balanced diet myself its not going to put in what isnt there to begin with.