So many things can go wrong with a lease, off site or on, that it should never be done without a written contract.
No matter how many situations you might anticipate writing into a contract, there will always be one that you didn’t anticipate, so a good lease contract should offer protection from the unanticipated…
Just a few that I’ve known to occur:
Lessee loses interest, returns horse when owner is out of the country
Lessee’s trainer decides horse needs injections, proceeds to have them done without owner’s permission or knowledge
Horse returned lame (this is fairly common)
Lessee changes trainer (or farrier, or vet) or moves to a different facility
Lessee subleases horse to another party (with another trainer…)
Lessee fails to pay for lease
Lessee fails to pay vet or farrier or board or whatever, and those people come after the owner for payment
Horse gets ‘impounded’ for non-payment, owner ends up paying the ransom…
This list could go on and on and on…
Unless you are related to a lessee by blood that is thicker than a polar icecap (which isn’t saying much these days), a written contract is a must.