Ushna's Dog is the dog of Ushnar gro-Shadborgob. He can be found in New Sheoth, Crucible. If the Hero is a Khajiit, Ushnar may, because he's scared of cats, tell his dog to attack them. Ushnar's Dog is smaller than all other dogs in-game.
If he is killed, he'll respawn in two days. If Ushnar is killed he can be found outside his house.