He has the appearance of a doberman with a spiky collar.
Dobermon and Alice were sent by the Sovereign to give the tamers and their Digimon a message. They were attacked by D-Reaper agents, and eventually Creep Hands appeared. Dobermon revealed his message was from the Sovereign, and sacrificed himself to give the tamers and their Digimon the ability to biomerge on Earth.
He dissolved into sparks from this, but his spirit briefly returned before disappearing.