If you happen to see one, you might not believe your eyes. Let's say you're driving along the open road when you start to make out something improbable. You get closer and sure enough: That motorcycle has a sidecar. Closer still, and — holy smoke! — that sidecar has a dog in it! Sporting protective eyewear, no less.

Yeah, they're called Doggles. And this sort of sighting may not be as unicorn-like as you think. Scattered across the United States is a colorful subculture of motorcyclists with sidecars, and dogs who ride in those sidecars.

Here, four dog-is-my-copilot motorcyclists from across the country tell their stories, which have been edited for length and clarity.

Rhonda Reynolds, 66, and Mooloo

Spooner, Wis.; riding together since 2012

 Rhonda Reynolds rides with poodle Mooloo near Spooner, Wis.
Mary Mathis / Washington Post News Service
Rhonda Reynolds rides with poodle Mooloo near Spooner, Wis.

I’d been riding motorcycles for maybe 10 or 15 years, and I wanted to get a dog. I had two previous dogs that were homebodies, so they stayed home whenever I went motorcycle riding. When they passed on, I wanted to get another dog, so I decided to have a sidecar added, and at about that time, Mooloo got to be about 6 months old. The sidecar was done, she jumped right in, and it hasn’t been the same since.

It was short rides at first, but what was amazing was how much she obviously enjoyed it. She's got her face pointed forward and her nose in the wind — I think Mooloo just likes the smells. There'll be horses or cows, or especially deer or bear. She'll sit up real tall and she'll look at them.

I've had dogs my whole life, and, obviously, they're here for a relatively short period of time. I got to thinking, "Well, the more I do with Mooloo now, and the longer I do those things, if I outlive Mooloo, I will be able to look back at those things, and be able to tie those experiences to Mooloo." So in addition to her enjoying it, I can enjoy it now, but also enjoy it again later on in life.

Randy Lazar, 58, and Doc Holliday

San Diego; riding together since 2015

 Doc Holliday checks for wildlife in the desert en route to Tombstone, Ariz.
Randy Lazar / Washington Post News Service
Doc Holliday checks for wildlife in the desert en route to Tombstone, Ariz.

I’ve been into dogs all my life and been into motorcycles for 30-plus years. When I realized I was going to be going around the world, I’d just adopted Doc. I said, “I’ve got to figure out if I can do it with the dog.” So that’s when I decided to have a sidecar built.

I had my specs for the size of the body so Doc could stand and lay down and turn around in it and be comfortable. A lot people have their dogs in the sidecar out in the open, and I know I'm going to be going a long distance with lots of weather, so I need to keep him out of the rain and out of the sun. It's a convertible, so I can take the cover off.

At the end of 2016, we did four months on the West Coast. In 2017, we went for another four months, and the whole goal of the last part of that trip in the U.S. was to see my friends and family before I head out for a few years. [Next], we'll start out in Arizona, saying goodbye to some friends, and then we'll cross into Mexico.

Ron Ridenour, 68, Isabel and Woden

Lake Five, Mont.; riding together since 2014

Isabel and Woden test the sidecar's seating capacity at Lake Five Resort, Mont.
Ron Ridenour / Washington Post News Service
Isabel and Woden test the sidecar's seating capacity at Lake Five Resort, Mont.

When you have your buddies with you, you can look over there and say, “How are you doing?” You know? I mean, they’re always ready to go. Unless you get a kid, I don’t think too many people want to go in a sidecar. They would rather ride on the back, the way I always figured it.

And so that sidecar is a great vehicle, if you will, or a great situation for a dog. They're kind of cramped in there, so I worry about them a little bit getting a paw outside of that sidecar and into the spokes, or something. I have a mirror situated so that I can always glance over there, look in that mirror, and make sure they aren't sticking a paw out.

But they're sure ready to go. If I tell them to go get in, they jump in. They're just getting their little excitement the same as I am. We're a team, we're always a team.

Richard Nordstrom, 65, and Harley

Tampa, Fla.; riding together since 2005

Harley, a Chihuahua-Pekinese mix, is a highly recognizable and popular figure at events in Tampa, Fla.
Duncan Strauss / Washington Post News Service
Harley, a Chihuahua-Pekinese mix, is a highly recognizable and popular figure at events in Tampa, Fla.

I saw a sidecar for sale just shortly after I got Harley. I said, “Hey, this would be perfect with Harley to ride this rig,” so we bought it off eBay for about $13,000. We got him in January of that year. I was carrying him in my front pocket — he was raised in my front pocket.

I don't know why I decided to call him Harley, but every time we're in a car or the bike, it doesn't matter, you can tell Harley's just excited when he sees another bike. He's proved to be every bit of a Harley.

He loves to meet people. People love to meet him, obviously, and it’s just so exciting for me and Harley to be out there meeting people. It gives me a sense of community fulfillment doing fund-raisers for different organizations, whether it’s veterans or some animal function. Everybody in the Tampa area knows Harley’s name. Nobody knows mine, but everybody knows Harley.