Mutant Giant Spider Dog is a prank video that exploded on YouTube in the mid-2010s, becoming one of the platform’s defining viral hits. Released in 2014, the clip racked up more than 184 million views and quickly spread across social media worldwide. It was created by Polish YouTuber Sylwester Wardęga and centers on his dog, Chica, dressed in an oversized spider costume to frighten unsuspecting passersby.