I agree with Sandy and Patty – I’d drop the lamb and mutton. While lamb is leaner than mutton, it’s typically still pretty high in fat. Bison or rabbit would be a good lean substitute. Sometimes MPC has “Bison Supermix” which is tripe and organs – my dogs love it.
As far as what to add, as long as the grinds contain meat/organ/bone I’d just suggest adding cod liver oil or tinned sardines a few days per week (omega 3’s and vitamin d), vitamin e, cooked/pureed vegetables and a whole food supplement (kelp, alfalfa, etc. – you can mix your own or buy a pre-mixed supplement). You can also add things like nuts, seeds, dairy, eggs, etc. a few days a week for some variety and added nutrients.
