I can relate to that.....
I've got one tractor here that has these stupid steps to get in and out of the cab..... and that particular machine has broken a back foot on two different dogs, and nearly broke it on a third.
I have to instruct anyone here who runs it, to never let a dog enter and exit equipment unassisted. Their feet just aren't designed like ours and they can slip right through slats on things. They keep traveling down with gravity, and their foot stays behind.... not pretty.
"it's a doggy dog world out there"