I am trying to find a good food for all of my dogs. I have a 14 year old chihuahua with heart, liver and kidney issues, a 9 year old chihuahua, and a 6 year old shih tzu with immune mediated polyarthritis. I know my older chi should be on something low sodium for her heart, but I don't know if that would also be okay for the other two. I feed mostly dry, but I would like to convert to mostly canned. I talked to the vet about a prescription diet for Gypsy, but he doesn't feel that she needs one yet and said she should be on a good senior food. I was thinking Innova senior, but I don't know how I feel about them being bought by P&G. Now I'm looking into Blue Buffalo because they have a small breed senior formula and from what I've read, they don't outsource. I'm open to all suggestions, except raw. They have never had it and I don't feel comfortable with starting them on it now with their ages. Homecooking is an option, I just want to make sure it's done correctly if I do.