It is potentially one of my all-time favourite Data and Worf interactions from the episode Phantasms:
WORF: Commander. I will have to confiscate your sidearm.
DATA: Of course. (hands over the phaser) May I ask a personal favour?
DATA: Will you take care of Spot for me?
WORF: Your animal?
DATA: I am afraid if I have another waking dream, I might injure him.
WORF: Of course. Spot, come here.
DATA: Unlike a canine, Spot does not respond to verbal commands. (hands him to Worf who holds him at arms length) Goodbye, Spot. He will need to be fed once a day. He prefers feline supplement number twenty five.
WORF: I understand.
DATA: And he will require water. And you must provide him with a sand box. And you must talk to him. Tell him he is a pretty cat, and a good cat.
WORF: I will feed him.
DATA: Perhaps that will be enough.
(Worf leaves, sneezing)
Transcript courtesy of the BEST Star Trek transcript website: Chrissie’s Transcripts Site.
Thanks to the patron who ordered this Star Trek commission piece!