would trotting them alongside a bike help improve their feet? I'm not saying they'd make bad feet good, but wouldn't it help?
Apart from toughening the pads,and shortening the nails,trotting a dog wont make the bones any more durable,as far as looks go it's nice to have tight cat like feet on a dog,but there is no guarantee that they will be any more resistant to damage than a more flat footed dog,it's all in the bones,and to some extent running style,terrain etc