Introducing... the doggie treadmill.
Along with being cardio for your pup you can also run training programs that help to work on their misbehavior issues like agression.
The dog is attached to the device with a leash, but is able to jump off from side to side.
** NOTE: Not all dog treadmills are safe, so it's important to do your research before buying one.
The recommended 20 to 30 minute workouts are good options for people who are elderly, injured or living in small spaces and have a hard time getting their dog the exercise they need.