Teeno was the bramble lynx companion of Merrin, a Nightsister from Dathomir, when Merrin was a Dathomirian child living on that planet. Merrin recounted that Teeno began as a small creature, but through proper upbringing, became "very cute;" she was a protector of Merrin's, willing to tear apart anything that threatened her. Teeno enjoyed nydak blood and receiving chin scratches.
During 20 BBY, General Grievous and his Separatist Droid Army attacked the Nightsisters, leading to their deaths, and Merrin became one of the few to survive; she and Teeno were separated, never to see each other again. Sometime between 12 BBY and 11 BBY, while a member of the Stinger Mantis crew, Merrin reminisced about Teeno, considering her the finest creature she had ever known. When Chellwinark Frethylrin, her new love interest and an Imperial deserter, requested that Merrin share something about herself, Merrin chose to speak of Teeno. Frethylrin found Merrin's description of the bramble lynx as "very good at murders" amusing, and subsequently offered Merrin comfort concerning her past losses.