The Cat is the easiest pet to get and a great first companion: it keeps you alive when a fight goes badly.
Cat Common
Healing Purr: When your HP falls below 30%, your cat purrs and restores some of your HP.
Help Old Mara in Aeven find her missing kitten (quest: The Missing Kitten).
How to get it
Do The Missing Kitten in Aeven: Old Mara has lost her kitten Mittens. You find Mittens somewhere warm that smells of food (the Aeven Pub), bring the news back to Old Mara and receive a Common Cat and 150 experience. You can earn it once per character.
Ability: Healing Purr
When your HP falls below 30 %, your cat purrs and restores some of your HP. The amount grows with your cat's level and with your own maximum HP, so the cat stays useful at every level. Cooldown: 20 seconds.
Solo players and anyone learning to fight. Combine it with potions on your hotbar for long hunting trips.