The horse can be found if you click on the little horse icon in the bottom left corner.
The horse poops all the time. The poop releases a deadly, airborne toxic that will kill your horse within fifteen seconds, unless the poop is removed.
If the horse poops twice within a short span of time, the poop will release twice as much toxin, killing the horse twice as fast.
You remove the poop by clicking on it.
If you don’t remove the poop and the horse dies, you can hatch a new one. Presumably from an egg.
No, you can’t change its name.
Clicking on the horse itself will make a small heart pop up and then drift upwards. The heart is completely useless. It will not save your horse from the poop toxin.
Clicking anywhere else will do absolutely nothing.
Going to a different part of Tumblr - anywhere that’s not your dash - will pause the horse.
Shutting down your computer will pause the horse.
Switching tabs to another site, like Facebook or Google, will pause the horse.
Minimizing the horse window will not pause the horse.