@AlexS - not sure how old she was.. neither parent had arthritis. Honestly, it's really out of the blue and I have no explanation.
@shaggy - I completely understand where you're coming from! And, of course, my pleasure! I hope it offered some advice and insight into a new philosophy with horses.
@gottatrot - Thank you for sharing your story. I'm so sorry about the accident. That must have been really hard for you. However, you have hope, and you still love your mare, and that's what matters! You truly understand how grateful we need to be for every moment. You're right. She is so lucky to be alive and loved!