I would go for the same idea, but with cats in a shelter. Every time an email arrives, a treat is delivered to the cat horde and the resulting commotion is film

I would go for the same idea, but with cats in a shelter. Every time an email arrives, a treat is delivered to the cat horde and the resulting commotion is filmed and a linked delivered to the sender, with a caption like: "We want MOAR!!" etc. With a few hundred dollars on hardware you can generate thousand of hours of quality video content, much more entertaining than a random keyboard press. No offense, but horses are clearly less, shall we say, intellectually gifted to handle the subtleties of digital social interaction in the cat age. Horses are plain boring, yesteryear's thing, wouldn't want one in the apartment of my owner.