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.

Pets contribute a very small amount of additional damage in battle. Pets can be found in pet carriers and are assigned to dwellers in a similar fashion to weapons and clothing. The rarer the pet, the greater the bonus it confers but even pets of the same rarity may give bonuses with slightly different strengths. Pets can be found in common form with generic breed names, rare form with generic names or a uniquely-named legendary form. One pet may be assigned to each single unpaired room, with two pets the maximum for double rooms and three for triple paired rooms. Assigned pets can be used either inside the vault or outside in the wasteland. Pets are domesticated small animals, specifically cats, dogs and parrots, that confer a bonus effect on the dweller to which they are assigned. “ Move pets around to the dwellers that most need their bonuses ” - Vault Dweller's Survival Guideįallout Shelter pets are domestic animals added to Fallout Shelter with the 1.4 update.

Fallout shelter pet wiki