Watchog is a bipedal, rodent-like Pokémon that bears a resemblance to chipmunks, groundhogs, and meerkats. 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. The yellow patterns on its chest resemble a worker's yellow safety vest. Watchog uses bio-luminescence to illuminate its eyes and the yellow patterns on its body; the flashing of light they produce stuns their foes.
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.
Watchog shares traits with rodents such as chipmunks and groundhogs. It also resembles a meerkat.
Its English name, Watchog, may be a combination of "watch", "groundhog, and possibly "watchdog" (due to its tendency to intently watch for predators).
Its Japanese name, Miruhog, may be a combination of meerkat (since it is shown to stand like one) and groundhog (from its appearance).