However, there are downsides to guide horses. Horses eat more than dogs, so having one means spending a lot more money and picking up a lot more poop. They can spook easily and rear up and kick the shit out of you (this sucks worse when you are blind). They're also larger than dogs, so they're more difficult to transport in cars or airplanes. Plus, some businesses will almost certainly think you're playing some kind of hidden camera prank on them.
"Yeah, just try me, you tiny asshole."
And, although service animals are protected under the Americans With Disabilities Act, some areas are reluctant to classify horses as service animals, for reasons that aren't entirely clear. Sometimes they're labeled companion animals, exotic animals or livestock. This has led to lawsuits from mini-horse owners, whose complaints presumably were along the lines of "I'm blind, guys. Let me have my damn horse."
No, but seriously. These goddamn sneakers, you guys.