A man, a horse and a duck walk onto a bus...

Today's New York Times reports a veritable explosion in the species of service animals roaming the streets and public transportation. While dogs have long helped blind people navigate through their every day lives, therapy dogs and cats have become more prevalent in hospitals, nursing homes and hospices. Certain breeds of monkey have also helped stroke patients with their daily tasks. Now, apparently, just about any animal on Noah's Ark is making a difference.

The Times story opens with a few paragraphs about a blind woman who is aided by a miniature horse. Apparently they're a great alternative to the average guide dog. They live about 30 years, a time span in which the person in need might expect to retire five or six service dogs. And yes, horses can be house trained. However, they're not quite as convenient for public transportation. Unlike a guide dog who can curl up at his/her person's feet, the guide miniature horse has to stand at the bulkhead -- or in first class.

Other people -- many with mental illnesses or severe emotional issues -- have found that a particular cat, bird or even ferret can provide therapeutic calming guidance.

Now, I'm a huge fan of animals and know first hand what a wonderful impact they can have on one's life. Nonetheless, the story got me thinking of that old joke, "a horse walks into a bar..." What if a horse, a cat and a parrot went into a bar with their people?

Punch line, anyone?