I'm boarding a yearling bull for a guy right now. It's my first time doing it, but this is how I charge: $3.75/day for feed (he's not getting anything fancy, just fed with my 4-H steer). Whenever there's an expense or extra work to be done, ie picturing the bull, putting a ring in his nose, I charge for it (so like $10 to picture him, $15 to buy the ring and it in). I charged $100 to halterbreak the bull. I charge $75 (some people charge more) each time he needs to be clipped (Once for the picture, once for the show). They pay for any vaccines, ivomec, that sort of stuff. At the show I charge $100/day (that covers feed, washing, fitting, everything that I do that day) plus they pay the hotel fee. If there was more than one animal taken to the show, you'd charge more per day. One piece of advise I have is to make the owner of the animal sign a contract saying that if an animal does die or get injured while in your care, you are not responsible. This just keeps you covered in case the animal should fall over dead for no reason.