my dogs really underweight?

I have a staff who's 13, he really really underweightI can see his ribs, hhe's up to date with his worming. I've put him on a high protein food but isn't helping him put weight on. I don't walk him anymore as his poor little legs can't handle it, he sleeps most days now so he's not running around to burn his food of. What else can I do yo help him put weight on? I'm really worried the weight loss will lead to more serious problems



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