We do not recommend greyhounds free running in any form of shoe, ours included (not yet anyway*). Greyhounds have spectacular acceleration and can turn and manoeuvre on a dime, or sixpence! No shoe yet made can accommodate that for our swift, stick-legged pals. They would need studs or spikes of some sort, to compensate their inability to use their claws which give them almost all their grip. It would be dangerous for a greyhound to run freely in shoes as they do not have enough 'feel underfoot' and are liable to misjudge stops, turns and zooms leading to any manner of accident. *We are working on a patent shoe design that will allow off lead activity and hope to bring that to market in the coming months.