I had a girl rescued from the China Canidrome. They ruined her kidneys.
I'm sorry to say I only got 18 months with her, she passed at age 6.
I cooked a kidneys diet for her. Heavy on the rice or macaroni, and veggies. Then chicken or beef. To make it more palatable I cooked the meat, then added water to the pot and cooked the carbs.
Kidney disease makes them nauseous. When all the appetite stimulants can't get them to eat, that's when you say goodbye.
I'm sorry.