I take a soft rag and use Aguamenti to wet it and wipe up as much of the blood I can. I then use my wand to shave off some of the hair surrounding the long but shallow cut. I don’t know what’s safe for normal animals, but a healing salve should be fine. At the first sign of something wrong I’ll clean it off and out of the wound. As the last step I use Ferula to wrap the wound.