I'll second the suggestion for a Myerchin. They are fantastic utility knives and one of the only suggestions that takes into account your need to clean hooves. They have what is known as a marlin spike on them and besides being a handy (yet gentle pick) for those hooves it will come in handy when working with various types of line. Case knives is also making a knife with a pick and blade that was well thought out for horsemen and is plenty robust to handle the daily rigors of farm work.