Dog owners: Is it healthy for dogs to eat chicken bones?

I have a darling (to me) little chihuahua. I’ve been on a soup kick recently, and occasionally I’ve been giving him the boiled bones as a treat. Considering his size, I’m wondering if people have any information or thoughts on whether this is a bad idea altogether, and if not whether there is a strict limit on the bones in his diet.

Note: my dog is insane about treats – and eats the bones, as they are often soft, completely and in a very short time.