Thanks for the responses, everyone. I really appreciate the support and acknowledgement that there is not a clear answer. Horse people in my real life fall into two very black and white camps. Those who have witnessed up close what mare and I have gone through ask why I haven’t done it already and broken the cycle, while those who have not been exposed to the details of every episode are horrified I’m even considering euthanasia.
The concept of what I can afford is murky. On paper, I can fund her vet care indefinitely, but not without significant sacrifice on the part of DH. I don’t mind driving my beater for another few years and wearing old clothes, but we have had to delay necessary work on our house due to vet bills, which means DH never gets to purchase/do things he wants. He is completely tolerant of this if I’m content, but the 4 months out of the year my horse acts miserable means that I am a miserable crazy person for 4 months out of the year. So the combination of having a weeping wife because the mare has dull eyes with wrinkled nostrils and laid-back ears AND not being able to afford a new computer because we are spending 2x the cost of the computer on vet bills is difficult for him. But the mare has always turned around.
My vets acknowledge that my horse has an unusual number and variety of issues despite very good care and management, and understand that at some point I will likely be done if the mare doesn’t beat me to it. They don’t have strong recommendations either way.
I guess I can put it this way- if there were some majikal pill that I could give her every day for the rest of her life, even if it were expensive, that would allow her to live her life happily and comfortably in a retirement barn, everyone would be happy. It’s the constant cycle of “the horse is uncomfortable and requiring thousands of dollars and 3x daily care,” then she’s slowly recovering, then “oh wait, something is wrong again” that is so mentally and emotionally wearing.
Thinking back, I don’t think she’s ever done well over winter, but always for a different reason- two years (but 3 or 4 years apart) it was foot issues that required x-rays and specially crafted shoes, one year she fell on ice in the pasture and was wounded, one year she had an SI injury of unknown origin at the end of summer (long rehab), one year was GI troubles, one year was her back, this year it’s wounds from a really unnecessary injury that has somehow resulted in an infection in a leg that was not wounded.
I don’t have aspirations for riding her. I enjoy spending time with her and handwalking together on our well-groomed trails in summer. This winter I had plans to do a lot of indoor handwalking with her to give myself a little exercise and keep her moving. I like grooming too. But spending time with her when she acts unhappy wrecks me, and the proportion of the year she spends on mandatory stall rest (which makes her particularly unhappy) seems to increase each year. And that’s the real problem.