My dog is acting weird after he ate a bone?

I bought a dog bone at the store and gave it to my Boxer, Boaz. He usually scarfs chewbones down but he stopped halfway through and walked away, and then my parents said he was acting a little weird, like acting like he was gonna throw up, but he never did... So I went to the place where he ate the bone and noticed several sharp fragments. He is a boxer so he drools, but not excesively, but his lips are dripping slightly now and he's just laying on the floor. Could he have swollowed a sharp fragment or just have a bellyache from his sensative stomach??