Fallout Shelter pets

Fallout Shelter pets are domestic animals added to Fallout Shelter with the 1.4 update.

Characteristics
Pets are domesticated small animals, specifically cats, dogs and parrots, that confer a bonus effect on the dweller to which they are assigned. Assigned pets can be used either inside the vault or outside in the wasteland. One pet may be assigned to each single unpaired room, with two pets the maximum for double rooms and three for triple paired rooms.

Pets can be found in common form with generic breed names, rare form with generic names or a uniquely-named legendary form. The rarer the pet, the greater the bonus it confers but even identical pets may confer bonuses with slightly different strengths. Pets can be found in s and are assigned to dwellers in a similar fashion to weapons and clothing.

Pets contribute a very small amount of additional damage in battle.

Pets are indestructible. If a pet's owner dies on a quest or while exploring, the pet will return home alone along with the owner's inventory, including equipped items. This makes pets especially useful in survival mode where resurrecting dwellers is not possible and quests are more difficult.