No people food what so ever! and just make sure that you are just giving good dog food. It doesn't have to be really expensive, it just has to work for your dog. Do not try changing food without mixing first with the old food, a week half and half is a good try. If that is more wet bowels, then , wait 2 weeks. You must change food slowly, so that their body can adjust.
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If after you have found a food that is good for your dog, you can start some people food. Green beans, raw carrots, and meat that has not been cooked with onions, onions are bad for dogs. Cooked food, is rice, potatoes, carrots, I am sure there is more, can't think right now. Eggs, and even bread, if your dog is low on food, and needs something.
There are alot of sites that you could check out, and they will tell you what your dog will love, and what your dog will not want, but these are just plain stuff that will get you by. Good luck with hardening his stool, I give my dogs a raw egg with their morning kibble every 3 days. That seems to help their coat.
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I Love my dogs, they keep me focused! 
And here is another one, "My dogs aren't spoiled, we are just well trained!"  | 
Diet/Dog food for stiffer stool 
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