Many dogs don't know they have back feet.They go where their noses and eyes lead them, and everything else just kind of follows. Some dog agility trainers use and/or recommend a horizontal ladder to help dogs learn that they have back feet and also learn what to do with them. By having the dog walk inside the rungs, it helps the dog gain confidence on the dogwalk, teeter, or anywhere it must use all four feet quickly and accurately.
The ladder is 7' with rungs spaced 12" apart (good for any size dog), and it stands a few inches off the ground. Comes with easy assembly and training instructions.