A Great Dane puppy runs while its owner cycles --- and when it gets tired?

Large dogs need a lot more physical exercise than smaller dogs, but it is also true that their body gets tired more easily. Therefore, it is important to give large dogs the proper amount of rest they need and to avoid pushing them too hard. 

Consequently, since he did want to give up bringing his four-legged friend along when he goes cycling, this man had an idea! He built and attached to his bicycle a wagon cart large enough to accommodate his Great Dane named Luther, in case he gets tired of running. The Great Dane puppy seems to appreciate the solution!