How does the concept of Tza’ar Ba’alei Chaim deal with putting an animal out of its misery by killing it in order to prevent unnecessary pain (of the animal)?
For instance, when one sees an animal with a broken spine lying on the side of the road and he cannot take it to the vet without hurting it, and one cannot, for whatever reason, bring a vet to the animal, or else assume that one is a vet and can determine that there is no way to nurse the animal back to health.