A West Virginia UPS driver says many find no shortage of company in the four-legged friends they meet along their delivery routes. Sean McCarren of Falling Waters, West Virginia says it’s common for delivery drivers to keep boxes of dog treats on hand. And he’s now started a Facebook page called UPS Dogs to share some of his furry friends.

"I know people who buy a couple of boxes [of dog treats] a week," McCarren told TODAY. "As soon as you deliver to a stop, especially in rural areas, (the dogs) start popping up in your truck. They become a part of your family, kinda. They’re expecting you. The worst is when you run out of treats, next time, they get a double treat!"

After noticing a dog-pile of pictures on his phone, McCarren started the Facebook page in 2013 to share the highlights. Four years later, the page has over 500,000 followers and contributors from across the globe, some of whom are now real-life friends.

"At first I started adding a couple of local drivers, then it starts to spread," McCarren recalled. "Slowly it trickles out. Some lady from Spain a few years ago liked the page — people from London, Germany. It's really catching fire. I have people bombarding me with dogs right now.”

Many posts are fluffy, others tell more emotional stories. One driver adopted a pit bull named Leo after his owner passed away.

Drivers have also used the group to seek support in times of loss.

"There's sadness, when you lose dogs on the route," McCarren explained. "Last year I lost a dog, Belle. She would come out and greet me and expect a treat, and then she died suddenly last year. You see (these dogs) every day. It's tough on the families, too."

The page has also run posts featuring cats, deer, donkeys and pigs. But dogs will always be McCarren's first love.

"There’s nothing you can say negative about dogs," he said. "Dogs aren't just man's best friend, they're people’s best friend. Everybody loves dogs."