What would happen if a dog ate snappers?

Well I ask this cause my fiances nieces and nephew got some of those snapper things you throw on the ground. They don't pay attention to what they leave where and the neighbors dog come over here all the time. He tends to eat things he shouldn't like once the kids let him have a wrapped piece of cheese. Well I just found un used snappers left out there luckily he hasn't came over today but I wondered what it would do to him if he ate them.