I think the horse is unquestionably man's best friend, over the dog, indeed I value my horse a lot.
The feeling, excitement, happiness and tranquility that they transmit upon mounting them, upon feeling their gait, trot or gallop.
It is incredible, wondrous and also difficult to explain, not to mention interacting with them through sight, voice, and touch. How you treat them is how they treat you.
Man's best friend...The Horse