Those EYES

How could I not!!!!
Panda our 10+ year old border collie just loves to run. Can't tell you how many times she has been Cindy's training buddy during Cindy's 3 wins and never out of the top 7 at Pikes Peak Ascent. But now she has a bad hip/knee. But she knows when the running shoes get tied it's time to go. Last week I took her out for a flat 5 mile jog. She couldn't get up the 3 stairs to our bedroom for 2 days. I had to prod and lift her.
So I'm lacing up the shoes and there she is excitedly whining and looking at me with those EYES. So I hooked up the coupler and took both dogs on my 35 minute run. She's already limping but if I laced up my shoes in the next 5 minutes she'd be looking at me begging to go.
What would you do?