I read this is an issue for many automatic doors. I put my door opening about a foot off the floor. The birds step up on a cinder block to get out of the coop. Of course, there's a ramp going down to the run. I haven't had any problems with stuff in the tracks, but it's only been in for a...
I studied them for some time before I got a Ladies First. Install was easy, but I suspect that's true for most. When I tested the closing on an obstruction it worked great. Basically, when the door met resistance it raised, then lowered again. If the chicken,or hand, is still there it repeats...