It sounds like it could be a bit dangerous. Someone's feet might get under it or it might gobble up the dachshund...assuming he was silly enough to get that near a roaring machine. Dachshunds hate vacuum cleaners and mowers and other such noisy, infernal mechanized devices, so they usually keep their distance from them unless they are the really aggressive type. If so, they may attempt to close with the hated machine that is violating their territory and engage in a battle to the death with it. With the hovermower that would not be good.