These "creatures from outer space" are actually dogs dressed up!
They're contestants in the Alien Pet Contest, which is part of the annual Roswell UFO Festival in the US.
Roswell was the site of an alleged spacecraft crash in July 1947 and sci-fi fans have since celebrated their supernatural heritage with the four-day festival.
Some pet owners got so into the spirit that they dyed their mutts green. Thankfully, it was dye suitable for animal fur!
While most people might think they're barking mad, we secretly love the costumes!
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