I question the design of this study. It seems that there was no control group with full-sized horses and donkeys.

I think it would improve my mood too.

Can’t be sad when there’s lil Sebastian

I took my kid to a school event, and there was a petting zoo that had some minuature horses among other things. One of the kindergarten aged kids pointed at the smallest horse and proclamed it to be a "Lowercase Horse".

It would just make me sad, like seeing a pug that's been inbred so much that its existence is suffering.

Breeding any animal to have dwarfism is unethical, no matter what the breeders claim.