Spit out

 Bob didn't like the dog of his girlfriend and one day he lured away the dog to a trap for some minutes because the dog barked a lot. But the dog ate rat poison. When the boy went to release the dog, and He saw the dog unconscious, he was freaked out he turn out calling his girlfriend when she arrived, she did her dog spit out the poison. Even though the end was happy she broke up her dating because he had lured away her dog in a trap.