[anonymous]

You could try something like Dogswell Happy Hips kibble as a base, and continue with the 1/2 homemade. Check chewy dot com for reviews and more information. My terrier does well on Nutrisca (same company), and my terrier likes the Dogswell Vitality kibble.

PS: I bet your vet will want to order some labs to rule out medical problems.
Regarding supplements and such, check SkeptVet (google for web address) use the search engine there to look up specific topics.