Eggdog refers to a series of videos and images featuring a white English Bull Terrier named Casper, edited to look perfectly oval like an egg. It gained massive popularity through YouTuber Zamsire, who created viral 3D animations of the creature performing various tasks, dancing, or stretching to impossible lengths. The meme is characterized by its surrealism, minimalist aesthetic, and high-pitched sound effects. Users typically use the template to represent something seemingly harmless yet chaotic, or to lean into the absurd 'weirdcore' internet humor that thrives on platforms like TikTok and YouTube.