Watchog is a bipedal, rodent-like Pokémon with large tan cheeks. It has small black eyes surrounded by hypnotic red and yellow rings. It is mainly rust-colored, with its puffy cheeks and neck a light beige color, and yellow stripes wrapping around its torso and tail. Its front and hind paws are white, as is the furry tip of its tail. Its arms seem to be crossed over its chest, possibly hiding a white tuft of fur.
Its Japanese name, Miruhog, may be a combination of meerkat (since it is shown to stand like one) and groundhog (from its appearance). Its English name, Watchog, may be a combination of "watch" and "groundhog."
Watchog was revealed on an Oha Suta trailer on July 29, 2010. It was officially revealed on the September issue of Coro Coro on August 8, 2010.
Watchog has fluff on the end of its tail, which it uses to alert others. This system is very similar to that of a white-tailed deer, whom they flash their tails to alert the rest of the herd that danger is approaching.