[InkedMarie]

James,
First, I’m hoping for a benign diagnosis. You’re on the right tract with high protein, low carb. I’;ll suggest grainfree as well. Grains can be inflammatory, your dog is older so there is probably some normal arthritis happening.
Some brands to look at that I like: Farmina, Brothers Complete, Annamaet, Dr Tim’s.
If you get a diagnosis that you don’t want, I’d suggest you work with a holistic vet on the best diet. Good luck, let us know the results.