Letter: Considerations in spaying.
D000818:Animals; D002369:Castration / Q000662:veterinary*; D002371:Cat Diseases / Q000209:etiology*; D002415:Cats; D004283:Dog Diseases / Q000209:etiology*; D004285:Dogs; D004967:Estrogens / Q000502:physiology; D005260:Female; D008321:Mammary Glands, Animal; D009369:Neoplasms / Q000378:metabolism / Q000662:veterinary*
D004967:Estrogens