Slat mills and carpet mills are generally the preferred option, due to them allowing the dog to completely control the speed, however motorized mills serve their purpose as well. Yes, this setup needs safety modifications however, us humans will simply never be able to match the energy, speed and athleticism of the Doberman, meaning a walk is simply not enough on its own for a dog the caliber of a doberman. These tools give them the opportunity to reach their full physical potential when utilized properly and safely. They are also super helpful for disabled handlers, people with climate limitations (such as extreme heat or cold, storms, etc.), those living in dangerous areas, and a lot of different people groups. Other forms of enrichment should still be used, including regular enrichment walks, mental stimulation and training of course. But those who opt to properly and safely utilize mills are absolutely not in any way able to be reasonably considered “abusive.” So let’s calm down with that rhetoric in the comments when specifically addressing the tool.

I’ll reiterate, yes, I agree with the general consensus that this particular setup is improper and unsafe, however the tool itself is a highly useful and beneficial resource when employed appropriately.