Some of this is trial and error. I have Portuguese Water Dogs who have many genetic issues but also strict testing by ethical breeders. I feed fish based foods, grain free. Taurine levels are normal. I also give a probiotic (one Thorne bacillus coagulants), human ester c, 500 mg tablet that I break in two for 250mg a day, and human vitamin e (Nordic ultimate omega, one mini per day), all prescribed by a holistic vet as my dog has a sensitive stomach, manageable IBS. I like Annamaet for a dry food, and use the one with fish. I add Sensibites for my pup and top it off with a good bit of Kasiks Salmon canned food and hot water to soften and make a broth. My 13 year old is on canned food only, three types, all grain free fish. If a canned fish approach interests you, let me know and I am happy to share the brands, which always include the salmon by Kasiks. I have not researched the fish approach for Taurine levels, although I would consult a holistic vet. Good luck!
