Let’s discuss some general, generic scenarios.
If a horse has a progressive condition that is causing it pain, and that pain cannot be effectively managed or treated, should the horse be euthanized?
If a horse is not safe to handle, for whatever reason, and handling that horse risks the safety of people who do handle it, should the horse be euthanized?
I’m posing these as generic, straight forward scenarios.
Everything and everyone dies. It cannot be avoided. We can control how and when it occurs for our pets, and the quality of their life up to that point. We can ensure that they have a good life, and a good death.
At some point in every life, there’s a day where the general direction is down. Where every day past that point, life is a little worse.
Animals live in the right now, and cannot escape their bodies. They can’t go have a rich social life online. They don’t decide that the pain is okay, because in six months they’ll get to see their daughter married. All they know is now.
Are you familiar with the concept of “better a week [day, month, year] too early, rather than a moment too late”? It’s the idea that it’s better to euthanize before it’s necessary, rather than wait until the animal is suffering.
Because why would you ever want a pet you love to suffer.
Something you haven’t really seemed to acknowledge is the concept that your mare is likely behaving this way because she HURTS. Because there’s something wrong in her body, and that pain is the root cause of how dangerous she is.
I encourage you to spend some time thinking about her behavior, and her future, through that lens. While retiring horses to a bucolic life in a green field feels really good to us, keeping an animal that is in pain alive is really unfair to that animal. They have to suffer because we can’t make the hard decision to let them go.
There’s no medal for letting a horse die naturally. As owners, their quality of life is our responsibility.