The rising surplus of dogs and cats.
D000818:Animals; D000829:Animals, Domestic; D002369:Castration; D002415:Cats; D003270:Contraceptive Agents; D003273:Contraceptive Devices / Q000662:veterinary; D004285:Dogs; D005260:Female; D007044:Hysterectomy; D008297:Male; D011158:Population Growth
D003270:Contraceptive Agents