Strange Stretching/Extending of legs

Hello All~
I have a 12 year old Paint horse (Cabbi) who has a very odd habit. He will extend his right front leg out, almost as if he is stretching, then pick up is left hind leg as high as he can. While doing this, he continues to stretch his right front leg out further and further. He tends to do this more when he is nervous or stressed, but I have seen him do it in the pasture as well. I got him 3 years ago from a friend of the family, and he was alone there for 5+ years. He had a goat for awhile, but it died a couple years before I got Cabbi. I thought at first that it was a nervous tick he picked up from being isolated for so long, but I had my vet and farrier check him out anyway. The vet had never seen anything like it, and he is a very experienced and acclaimed equine vet in my area. The farrier can't figure it out either. Cabbi isn't in any pain. The vet did flex tests, etc and didn't see anything out of the oridinary. Just wondering if anyone else has encountered something like this. It is very odd.

Thanks!

Our girls will do that too, they are just stretching. Ours will do some pretty strange looking contortions when they stretch, putting the two front legs out front and sticking the rear out like the way a cat stretches. Sometimes doing it the way your does, front foot out back leg out I think some horses do it more than others and in different ways. I have to admit it does look a bit odd

I have a mare whoes the cat stretch thing, stretches the front legs way out and sticks her butt way back and then she will stand uo and then lean really far forward and stcik her back legs out as far as she can to stretch them out, she does this whenever we go to take her out of the stall and it is the first thing she does when she hits the ground outside of the barn, then she goes tearing across the pasture at 100 mph.

One of our QH's does the cat stretch as well. Worried me the first time he did it, I thought he was going to go down. He was caually walking out of the barn and then bam out he went.

Probably just stretching, my gelding does the cat stretch thing as well and he also will stick one hind leg at a time straight out behind him.

I also stretch his front legs before we ride and now he's learned how to do it himself he'll put his front leg up on his paddock fence and lean down to stretch it like a dancer it's quite amusing although all the stretching at first alarmed me.