Animals on Shabbos
23. One may apply oil, on Shabbos, to a fresh wound which is causing an animal pain. However, it is forbidden to apply oil to a wound that is at the end [of the healing process], because it is done for the animal's pleasure ("ta'anug"), [and not for the alleviation of pain] (1).
(1) One is only permitted to exert oneself on Shabbos in order to alleviate an animal's suffering, but not to provide it with additional comforts or pleasure (Mishna Berura O"H 332:4).
Halacha-Yomi, Copyright (c) 2002 Project Genesis, Inc.