The dog in the propeller hat became one of these props thanks to Steam user Tones3D. Months later, starting in early October, Twitter users started posting a screenshot of Roscoe in a Garry’s ...

Stock image of a dog on its birthday. The German shorthaired pointer didn't want to take off her birthday hat. SeventyFour / BranstonandTwiglet/Getty Images ...

The internet was made for happy dog pics, so you can easily gain some major likes with the right dog birthday Instagram captions paired with shots of their adorable face.