What do you mean by "teething". Your pups teeth are "in". It is a bit early for them to be coming "out". If he is needing something to chew on, "flossies" are great! Take it away when it gets down to 2 inches long. I have never given anything for pain when teething. Does the pup seem in some type of pain? I know this sounds choppy, its just that teething is something that should pretty much go unnoticed. If it is a "chewing" problem, again, those flossies (or bully sticks) are great and keep them quite busy