This is the story of two unlikely best friends and how they came to be so close. It all started two and a half years ago, when one of them was just a baby and the other was forced to grow up.
More on Yahoo! : Boy and his dog become model friends
A Reddit user, known only as bleed-black, posted a series of photos that tracks the development of a baby's relationship with his family's yellow Labrador. The entire gallery is summed up in a single sentence: "My son and dog's 2 1/2 year friendship."
What follows is a photo essay on the evolution of an honest-to-goodness friendship between two species.
It starts with a dog nose, resting closer to a newborn — specifically, the newborn who co-opted the pup's role as the family baby.
More on Yahoo! Shine: Study Finds Link Between Dogs and Kids
As time passes, the dog's snout paves the way for full-fledged cuddles, mutual eye-gazing, and eventually a kiss. As months pass, the baby develops and so does his friendship with his four-legged older sibling.
They show each other their bellies, they watch movies together, and they generally put up with behavior neither one of them would tolerate from other folks. Don't think that dog gives back rides to just anyone. And sharing toys? Toddlers aren't usually big on that.
More on Yahoo! Shine: How to Add a Baby to a Dog Household
The photos may not seem as spit-take worthy as, say, a cat playing piano, but in the age of cute overload, sometimes it's the simple things that really move us.
"I smiled and cried simultaneously. This is so, so adorable that my emotions just can't process it," wrote one of the more than 1,700 Reddit users who commented on the post. "I'm so impressed by your dog's patience," added another.
The images, which were posted a month ago, have since racked up almost 150,000 views, and as of this week, they made a dent on Twitter, thanks to pickup from sites like Buzzfeed and PBS's parenting blog.
More on Yahoo! Shine:
Reddit Marriage Proposal Gets Mixed Reviews
6 Reasons Your Kid Needs a Dog
The Best Dog Breeds For Kids