Attuned Mount

Through careful training, practice, and experimentation, you have trained your mount to accept and attune to certain magical equipment. 
So long as your mount has appropriate anatomy, the character may attune a number of magical equipment to their mount equal to the character's Wisdom modifier. 

Using a Horse as an example, An amulet or necklace may be worn around the neck; goggles or lenses may be worn over the eyes; bracers or bracelets may worn on the forelegs or cannons; belts may be worn about the barrel; Rings may be worn only if the creature has appropriate digit or limb (i.e. A falcon's talon or octopus' tentacle). 

Equipment That has the "Outerware", "Footware", "Handware", "Headware" tags, or that encloses the mounts feet, hands, or head, such as gloves, boots or helmets, can not be equipped or attuned in such a manner. Similarly, any item that must be held are not able to be equipped or attuned.

All other rules for such equipment must be followed. Equipment effects the mount it is equipped