A Great Dane in Colorado gave birth to a litter of puppies and the owner was surprised to see most of the newborn dogs looking normal, but one of the precious creatures had green fur.

Owner Caddy Williams told KRDO, “It was so shocking when she was born,” she said, “Luckily, I had recently read an article about a green dog. So at least I knew what was going on.” What are the chances?

Williams initially thought the puppy had dark, black fur, the New York Post reports. She said, “It was dark, so I finally got out my phone flashlight — and she was green!”

As it turns out, the new puppy’s unique hue might look adorable, but actually caused by something gross. A chemical found in bile, called biliverdin, could be responsible for dying the pup’s fur green, the New York Post reports. Apparently, the chemical can be present in the womb and could alter the coloring of the animal.

Luckily, the condition isn’t dangerous or permanent — it will fade away and the puppy will be just fine!