05/08/2015 02:57 pm ET Updated May 11, 2015

Pet Rat And Dog Are Best Pals Because BFFs Come In All Shapes And Sizes

Meet Osiris.

Good morning from Osiris! #OsirisTheDog #OsirisAndRiff

A photo posted by Osiris + Riff Ratt 🐺💕🐭 (@osirisandriff) on

And meet Riff Ratt.

Osiris is a 3-year-old Dutch shepherd mix and Riff Ratt is a 3-month-old fancy rat. They both live in Chicago and apparently really couldn't be better friends.

#RiffRatt is getting pretty great at standing on his back legs!

A photo posted by Osiris + Riff Ratt 🐺💕🐭 (@osirisandriff) on

Photos of the unlikely duo playing ball together, giving each other licks and exchanging belly rubs have been posted on Instagram over the past few months. Osiris is even cool enough to let Riff explore the inner workings of his snout. Don't be alarmed -- apparently, this is "super typical."

Fancy rats are actually quite good pets, especially in small apartments that may be too cramped for a dog, Mashable notes. They're "curious, intelligent and always up for some fun," the American Society for the Prevention of Cruelty to Animals says, and can quickly learn to fall in love with their human companions. But, if you're considering adding one to your family, keep in mind that they live for up to three years and the ASPCA recommends giving them a companion.

Take a look at more shots of the pair on Instagram at @osirisandriff.

Back when #RiffRatt was just a little guy. #OsirisAndRiff

A photo posted by Osiris + Riff Ratt 🐺💕🐭 (@osirisandriff) on

#RiffRatt #OsirisAndRiff

A photo posted by Osiris + Riff Ratt 🐺💕🐭 (@osirisandriff) on

Osiris is just smiling away while Riff Ratt tries to crawl in his mouth yet again.

A photo posted by Osiris + Riff Ratt 🐺💕🐭 (@osirisandriff) on

H/T Mashable



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