Animal Item Slots
Although it's easy to imagine an animal benefiting from magic equipment beyond a simple saddle and a suit of barding, fitting a mount's physiology to the list of item slots available to characters is not an easy task. Try the following variant list of item slots for quadruped animals (and other monsters when appropriate).
One skull cap or helm
One pair of lenses or goggles
One collar
One saddle blanket or vest
One saddle or jacket
One belt or strap worn in front of or over the haunches
One pectoral or harness worn over the chest or shoulders
One pair foreleg bracers
One pair of foreleg shoes or mitts -- hoofed creatures wear shoes and creatures with paws wear mitts
Two rings -- creatures with toes wear rings on the toes and creatures with hooves wear "rings" just above fore hooves
One pair of hind leg shoes or mitts -- hoofed creatures wear shoes and creatures with paws wear mitts