I hope someone who has done this can start saying that I`m just being too careful with the person who lets my horse ride badly, not with the maintenance and plethora of other whatifs. However, entering into a lease with someone on the maintenance and use of a horse may not be as easy as you might expect. There are many factors, legal and emotional, you need to consider before you can make an informed decision. At the beginning of your research, take stock of what you have to offer and your goals. For example, if Gail compares a rider with a suitable horse to get him through, Gail considers four fundamental criteria: 1. the activity? What they`re going to do. 2. Capacity? the level of ability each has achieved and how they are likely to progress together. 3. The size of their stature in relation to each other. .