Help! what will happen to a puppy if it eats ant killer? Like one of those ant...

[Kate]

...dome things.? Help!
So this morning Kimmy left the bathroom door open and star my friends puppy, Star, went in there. Then when Kimmy went over there she saw that Star was chewing on something. It was a ant killer dome. Star had opened it and ate the stuff that kills ants. we googled "what will happen if a dog eats and killer" and didn't find much, just to make sure the dog drinks lots of water and if the dog starts acting strange to take it to the vet and stuff. Well its hard to tell if Star is acting strange, because Star is a strange dog (that's what my friend says anyway). I told her to take Star to the vet, but her dad doesn't want her to....he just wants to "see what happens"...even if Star ends up dying. So, is there a vet or anyone that has advice and knows what to do in this situation. Like....will the ant killer kill the dog??? And what exactly happens when a dog eats ant killer??