I live in ontario. In 99% of the barns i've been to, they require you to sign a risk waiver basically saying you understand the risks involved and you are to participate at your own risk, before riding a horse. 5% of those barns require you to sign the risk waiver before stepping into the barn.
The way the waivers are worded is that once you sign that sheet of paper you agree that any injury is your fault and the barn owners/managers/horse owners cannot be held liable in any way shape or form.
A Dog looks up to a man,
A cat looks down on a man,
But a patient horse looks a man in the eye and sees him as an equal