What is an emotional support animal? And which are allowed to fly on airplanes?

These days, every airline has a different answer, and the U.S. Department of Transportation has yet to come up with definitive rules as well.

So far, it’s up to individual airlines to set their rules.

United, for example, won’t allow peacocks or snakes aboard as emotional support animals.

But American will allow — I’m serious — miniature horses. Please don’t let me be on one of those flights.

And most recently, Delta has banned pit bull dog breeds because it claims having those dogs on board compromises its safety requirements. Delta issued the ban when the airline claimed that more than a third of all serious dog attacks were perpetrated by the breed.

The takeaway here is that if you have an emotional support animal, check with your individual airline. And if you have a miniature horse, please don’t sit next to me.