It was a fine harness and reins. The leather was soft and well tooled. The bit was so shiney one thought it could be silver. It looked like no bit and bridle that he had ever seen. Yet, it seemed familiar, like he had heard stories about this before.
"There is something about the outside of a horse…that is good for the inside of a man."
If a creature is transformed into another creature (say, a human into a dog), then that creature will become more and more accustomed to the new form until a point is reached where reversing the spell is impossible. A second transformation is possible, but the creature will have to go through the whole process again.