Linh's murcat was received by her in Nightfall at the shop Claws, Wings, Horns, and Things with Tam. In Lodestar, Grizel had proposed a game of Girls vs. Boys in finding Keefe's items of importance. As the girls had ended up winning, each of them was able to demand a favor from a boy. Tam, by default knew his sister was going to ask for a pet. She later used this favor and chose her murcat which was noted could be very sweet, with Tam remarking that their bites can make people lose fingers. Linh's murcat is part of an aquatic species, and it is seen to have scales on it.
In Legacy Marella tells Sophie that Linh named the murcat "Princess Purryfins". Marella states that she's "'pretty sure she Linh did it so Tam would have to say the words 'Princess Purryfins' on a regular basis.'"