Miniature horses can be trained to do the same work as guide dogs. They’re ideal for legally blind people who have allergies to dogs. Someone recently brought such a horse on BART, causing equal parts delight and concern from confused passengers.
https://www.sfchronicle.com/bayarea/article/Meet-Sweets-the-BART-riding-miniature-14816119.php
Unfortunately this particular guide-horse-in-training demonstrated it wasn’t quite ready for prime time since it apparently wasn’t yet housebroken.
