On the Cavalry Commander (5.2-5.3)

It is well also for the groom to have orders to remove the dung and litter daily to one and the same place. For by doing this he will get rid of it most easily and at the same time relieve the horse.

The groom must also know about putting the muzzle on the horse when he takes him out to be groomed or to the rolling-place. In fact he must always put the muzzle on when he leads him anywhere without a bridle.[*] For the muzzle prevents him from biting without hampering his breathing; and moreover, when it is put on, it goes far towards preventing any propensity to mischief.