Check out this adorable video of dogs in wheel carts playing with their owner Gritta Gotz.
You can see in the video that she takes her dogs out on a country trail and and tosses a stick around. The dogs in wheel carts don't seem to be phased by the terrain as they run back and forth, trying to get the stick.
Gritta Goetz posted this comment on her YouTube page:
The Dog who has always the Stick - is the leader of the pack. If he doesn't okay with , the dogs with wheelchair Get the Stick too :-) Don't worry, They are fast enough to Get it. And the smallest paralysed Dog is the One who Can "protect" the Stick against everybody. If she gets it, even the leader has No Chance anymore.