title: Readers disturbed about letter on free-roaming cats.
mesh_terms: D000827:Animal Welfare; D000818:Animals; D000835:Animals, Wild / Q000502:physiology*; D002369:Castration / Q000662:veterinary*; D002371:Cat Diseases / Q000517:prevention & control; D002415:Cats / Q000502:physiology*; D011155:Population Control