Most horse dildos are big, and only veterans will be able to submerge these beasts, but the reward is worth it, it feels amazing!! 
You’ll find other members of the equine family: ponies, mules, donkeys, and even unicorns and Pegasuses.  The most famous horse dildo is chance the stallion which is made by bad dragon, and available up to sizes of 15 inches long.
Make sure to use lots of lube, and warm up properly before attempting to mount these beasts, they are generally not a dildo for beginners!