Having a Tough Day? This Viral Photo of a Dog & Horse Who Are Best Friends Will Fix That

(Reddit)

Duder, a lab and pit bull mix, and Mac, an Arab horse, are quite the duo. They are also best buds who have been inseparable since they first met -- when Duder was just 8 weeks old.

The heartwarming photo above was posted by Reddit user red_fog on Tuesday and it has since gone viral.

"Of course he was a bit curious and skeptical of Mac, but Duder just kept his distance and stayed near my mom and I in the pasture. Over time Duder got a little brave and would nip at Mac's heels and try to chase him. Mac is 23-years-old and just didn't really pay him much attention," red_fog wrote.

Red_fog went on: "They usually play by running in circles…We have a giant horse ball that Mac picks up and Duder will try to steal it, but the ball only has one handle so Duder gets left trying to bite a basketball made of hard plastic."

The photo was reportedly taken by red_fog's mom, who wanted to spread some holiday cheer to others. And it did just that.

"When I see photos like this, it takes my stress away and warms my heart. Thank you," Reddit user AnimalLover1 commented.

Reddit user choufee, said the photo provided much needed break from "tragic and sad stuff."

"Especially during awful times when the entirety of social media is abuzz with tragic and sad stuff, we all need pictures like this to remind us of love. Positivity is also contagious and we need to remember that," user choufee wrote.

(H/T: Huffington Post)