I often tell people on here how ill-advised it is to rehome a pet privately and why they should only do so through a rescue which will homecheck the prospective new owner and guarantee to take the pet back at any stage in the animal's life if that owner cannot keep him. Sometimes I get the idea that people don't believe me despite me citing a recent case on MN where a lady took on a dog avertised by a stranger in her local paper which within the space of a weekend had bitten her neighbour's child and was put to sleep as a result.
Maybe this will change minds.