Four legs good. Two legs-two wheels better. 

Listen, it's important that you understand that while you're trudging through crowded city's streets, sullenly sweltering on subway platforms, and/or staring impotently across a sea of unmoving traffic on your long commute home, somewhere a lucky person is playing fetch with a pack of blissfully happy paraplegic dogs outfitted with rear-wheels:

In this particular video, that lucky person is Gritta Goetz, proprietor of the Gnadenhof Lanzenhainer Rasselbande animal sanctuary in Lanzenhain, Germany. But it's a big world, and there are probably others. It's important that you understand the vast discrepancy between how your life is and how your life could be.

Sources: Gritta Goetz | h/t Gawker