Terriermon

Terriermon is a Beast Digimon whose name and design are derived from the Terrier dog breed. With one horn growing from its head, it is a Digimon wrapped in mystery. It can be classified as a Beast-species Digimon from its body structure, but it's still not understood how its form changes throughout its Digivolution. Also, it is rumored that it is sometimes born with a twin, Lopmon. Where Lopmon has three horns growing from its head, and has the personality of a lonely crybaby, Terriermon has only one horn growing from its head, and has a calm but robust personality. It's a very cute type of Digimon, and from its calm behavior it doesn't seem like a "Combat Species", but when it battles, it shows that it is more powerful than it appears.

Digimon Frontier
A Terriermon was seen at the Autumn Leaf Fair.

Digimon World 3
A Terriermon is seen sleeping in Asuka Inn 2F.

Digimon Battle Spirit
Terriermon appears as both a default playable digimon who digivolves to MegaGargomon and as the main enemy in the "Origin Town" level.

Digital Monsters: D-Project
Any In-Training Digimon can digivolve into Terriermon when trained to certain stats in the "Cliff" area and can further digivolve into Gargomon.

Digimon World DS
Terriermon is found in the Steamy Jungle and can digivolve into Gargomon depending on its stats. There is also a Terriermon at Digi-Central who is the first Digimon you talk to in the game.

Digimon World Dawn/Dusk
Terriermon Digivolves from Gummymon, and can further digivolve into Gargomon depending on its stats.

Digimon rumble arena
Terriermon is a playable charecther and can digvolve to megagargomon

Digimon World Championship
Terriermon can digivolve into either D'Arcmon (20 Holy-AP), Unimon (20 Beast-AP), Gargomon (6 Battles), or Gatomon over time.

Attacks
 * Terrier Tornado (Petit Twister): Generates a tiny tornado by spinning its ears like a propeller.
 * Bunny Blast (Blazing Fire): Spits out shots of superheated air.

Unison Techniques
 * Double Typhoon: A mighty technique in which it performs its "Terrier Tornado"" alongside Lopmon's "Tiny Twister".

Variations / Subspecies
 * Lopmon