Working with and owning horses is unique because the life of an animal is at stake. Further, many horse owners and trainers still conduct business with a verbal agreement and a handshake believing horse owners are reputable people. That's fine: until something goes wrong. At that point each party will have a different recollection of what the deal was. So who is actually responsible for the veterinary costs if the horse is on a free lease and needs colic surgery, the lessee or the lessor? What happens if you buy a horse and find out later that the seller did not in fact own the horse and was not authorized to sell it? Were you given a Bill of Sale? Did you write up a contract? The answers to the above questions depend upon what is agreed to in advance and how you can prove it. If you put that agreement into writing it could save you both time and money.