Furret is a long, slim-bodied Pokémon with cream-colored fur and dark brown rings along the length of its body. The back of its head and neck are also dark brown; this marking extends to below its arms where the first ring is formed. It has cream-colored tips on its ears, two brown, whisker-like markings on each cheek, and round, black eyes. Its four limbs are stubby; the forepaws are brown and the hind paws cream-colored. Furret is capable of standing on its hind legs, but prefers to move on all fours. Its body and tail are so similar in structure that it is impossible to tell where its tail begins.
Despite its short limbs, Furret is very quick and agile. Its speed allows it to catch prey such as Rattata. It tends to burrow under the ground of meadows and other temperate grasslands. Its narrow burrows are well-suited for its slim body and are very difficult for other Pokémon to enter. The burrows also become more maze-like deeper inside, which makes it even harder to find Furret's nest. A mother Furret curls itself around its offspring to help them sleep.
Multiple Furret appeared in Celebi: The Voice of the Forest. One of them led Ash and his friends to the Lake of Life so they could heal an injured Celebi.
In A Claim to Flame!, Salvador's Furret battled Ash's Pikachu during the first battle of the Silver Conference. It repeatedly used Dig to confuse its opponent, but Pikachu broke through the strategy by latching onto Furret's back and using Thunderbolt to defeat it.
Further debuted in Pikachu & Pichu as a resident of Big Town.
Furret made its television debut in The Legend of Thunder!.
Furret made its main series debut in the banned episode EP250 as a Pokémon living in a forest outside the Ice Path.
Furret made its English dub debut in the main series in Fangs for Nothin' as a resident of the Dragon Holy Land. More Furret living there appeared in the follow-up episode. Two of them reappeared in a flashback in Better Eight Than Never.
A Trainer's Furret appeared in You're a Star, Larvitar!.
In A Bite to Remember, an injured Furret was under the care of Katrina. Another was wild.
In Game Winning Assist!, Julie owns a Furret as her battling Pokémon.
A Furret appeared in PK13.
A Coordinator's Furret appeared in Harley Rides Again.
A Coordinator's Furret appeared in What I Did for Love!.
In a flashback in Pokémon Ranger and the Temple of the Sea, multiple Furret helped Pokémon Ranger Jack Walker when he was a young boy lost in a blizzard.
A Furret appeared in Not on MY Watch Ya Don't!.
A Furret appeared in Wild in the Streets!.
A Furret appeared in Drifloon On the Wind!.
A Furret appeared in Top-Down Training!.
A Furret appeared in Dawn's Early Night!.
In Glory Blaze!, a Trainer's Furret competed in the Hearthome City Tag Battle Competition.
Multiple Furret appeared in Giratina and the Sky Warrior.
Multiple Furret appeared in Arceus and the Jewel of Life.
In Challenging a Towering Figure!, a Trainer's Furret battled Brock's Sudowoodo during the Festival Battle Challenge.
A Furret appeared in the opening sequence of Zoroark: Master of Illusions.
A Furret appeared in Mewtwo — Prologue to Awakening.
In Genesect and the Legend Awakened, a Furret was living in Pokémon Hills, while another Furret was in Mewtwo's flashback.
A Furret appeared in Kalos, Where Dreams and Adventures Begin!.
A Furret appeared in Lumiose City Pursuit!.
A Furret appeared in Clemont's Got a Secret!.
A Furret appeared in A Jolting Switcheroo!.
A Furret appeared in A PokéVision of Things to Come!.
A Furret appeared in A Battle by Any Other Name!.
A Furret appeared in The Bonds of Evolution!.
A Furret appeared in Heroes - Friends and Faux Alike!.
A Furret appeared in Dreaming a Performer's Dream!.
In A Showcase Debut!, a Performer's male Furret competed in the Coumarine City Pokémon Showcase. He reappeared in Performing with Fiery Charm! and Party Dancecapades!; in the latter episode, he danced alongside Serena's Eevee during Monsieur Pierre's dance party.
In Pikachu and the Pokémon Music Squad, a Furret was living in the forest.
A Trainer's Furret appeared in Master Class is in Session!.
A Trainer's Furret appeared in A League of His Own!
A Trainer's Furret appeared in Valuable Experience for All!
A Trainer's Furret appeared in Forming a More Perfect Union!.
A Furret appeared in a flashback in The Legend of X, Y, and Z!.
A Trainer's Furret appeared in The Power of Us.
Two Furret appeared in Finding a Legend!.
Two Trainers' Furret appeared in Trade, Borrow, and Steal!.
Furret appears to be based on a ferret.
Furret may a combination of fur and ferret. It may also be a play on turret, upon which sentries (Sentret's namesake) usually stand. Its name could also be inspired by the word furrow, a verb that means to make a rut, groove, or trail in, referring to Furret's body shape and gait.
Ootachi may be a combination of 大 ō (big) and 鼬 itachi (weasel), and it may also include 尾 o (tail) and 立つ tatsu (stand), just like Sentret's Japanese name, Otachi.