If you have your eye on a particular horse to buy, why not try to spend time riding and interacting with it in a variety of circumstances? There is no better way to evaluate the horse to decide if it will meet your expectations.
If you are the horse seller, you need to make ensure the horse is looked after and treated well in the trial period and returned to you if the trial is not satisfactory for any reason.
The rights and responsibilities of the seller and potential buyer in the evaluation period are defined by this contract.
This contract pre-sets the price and terms of the sale in the event that the potential buyer decides to purchase the horse.