Here Kitty, Kitty

Here Kitty, Kitty is a side quest in Fallout 4.

Detailed walkthrough
As the Sole Survivor enters Vault 81, Ashes, the cat of Erin Combes, inhabitant of the vault, runs out of the vault. Upon seeing this, residents of the vault will comment on it, directing the Sole Survivor to speak with Erin if asked about it. Erin may also approach the Sole Survivor herself. She explains Ashes scratched her and she yelled at him to go away, but she has no idea where he went. If the speech checks are passed when asking for a reward, she'll offer her favorite kickball, her old teddy bear, or, lastly, the heirloom she received from her mother. While not mentioned by her, the initial reward would have been a fusion core.

Ashes can be found east of the vault towards the Chestnut Hillock Reservoir, sitting on the docks, or on the opposite side of the reservoir, near the skeleton in the wheelchair. He may either be killed, which results in failing the quest, or talked to to have him independently walk back to the vault. Once he's back in the vault, talk to Erin again to receive the reward.

Bugs

 * Hearing about the quest from a NPC after accepting the quest from Erin will result in the quest telling you-you need to speak to Erin, marking her as the quest objective resulting in her only responding as though you had spoken to her and the cat not appearing at the dock.
 * On PC, it is possible to fix this bug by using the console commands and, then speaking to Erin.
 * If Ashes is killed during the quest and his body is brought back to Erin, then her dialog will seem as though Ashes was returned alive.
 * When you get Ashes home and talk to Erin, she may only say generic dialog and not reward you.
 * Ashes may not appear next to Erin when returned even though she talks to it normally and the quest is marked as complete.
 * Despite which speech check was passed, a different reward may be given, e.g., passing all three for the silver locket but being given a teddy bear.

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