I euthanized my late mare instead of pursuing diagnostics on her latest issues.
She was minorly mechanically lame, somewhere. She was at Purdue many times. I have probably 50 xrays of various joints/feet/back, and did 2 bone scans on her. Injections of nearly everything, nothing helped. Ultrasounded tendons, nothing. Nothing was ever found.
She got diagnosed with lymphoma about a year after I got her. We were keeping it at bay with steroids. I told her after the cancer diagnosis that I was not going to let things get really bad before I let her go. I was going to let her go with the fire and FU attitude she always had. That said, we were living like it was a non-issue.
She survived with the cancer for a year and a half or so. She was honestly going better than she ever had. She looked incredible.
And then over the period of a week one side of her hindquarters atrophied. She seemed to feel fine otherwise, running bucking kicking and bossing the geldings around. But her hindquarters - one side looked like the 3’3" jumper she was, the other side looked like a starvation case.
I took her to Purdue. I had them ultrasound for a broken pelvis (inconclusive), but stopped diagnostics right there. I didn’t take her home.
Could I have limped her along for longer, until it was obvious and staring us in the face? Absolutely. Did I keep my promise to her to let her go while the going was good? Yes. And I’m not sorry about it at all.
I had a necropsy done on her. Nothing was found for the lameness. I suspect maybe EPM, but I didn’t know you had to request that test special. For how bad it was atrophied and for the fact she had to be on steroids to keep the cancer at bay, there was nearly no hope of recovery.
ETA: She was 8. Things were not going to get better for her, and she was not what I would call “safe” for most people. I loved that mare for who she was - fire, opinions, stressy, brave. That mare would do ANYthing for me.