Has anyone tried it?
Anyone done it before?
Yes!

When poor Graham took a bad tumble off his porch/deck,he broke his wrist or elbow and it had to be fused;
then he wore a cast for quite a while.
Result was his leg atrophied (correct term ??) and he need Physical Therapy.

Mom (Miz Leslie {AdoreMyDogs}) found a K-9 Therapy Center that had
a Water Tank & Tread Mill...
And I think the Graham *LOVED* it!

I'll search and see if I can find the Graham Threads...

/s/ Phred