Sentret is a small furry mammal with a big round body with stubby arms and two small feet. Its fur is light brown, and it has a tail with dark brown stripes that it uses to stand on to see if there is danger nearby. It has long dark brown ears, a white ring on its belly, and white paw pads. While it is capable of standing on its hind legs, it usually moves on all four.
Sentret are able to stand on their tails. They do this to find out whether there is any danger nearby and also to warn others of possible danger. Their shrieks warn all Pokémon in the neighborhood of any possible danger.
Sentret has a very nervous and cautious behavior, apparently fearing for its life. It will not sleep alone, and usually sleeps while another of its kind watches for danger. When one sees a predator, it warns the rest in its pack, and they all flee.
Sentret appear frequently in the grasslands of the Johto region.
This Pokémon was unavailable prior to Generation I.