Silly Blackie, that's not a horse.
Silly unnamed lion thinking himself being a carrier for those canine fleabags.
...
I wonder if the lack of gesture, facial expression and tone of my voice will be a problem to understand the humoristic intention of those respond here. Or in short: Please don't be mad because I am just kidding around.

But still... there must be a commandment like: "You shall not ride on a lion for those creatures are way to majestic to be used for transportation." :D