YOU SAID:
Um yeah so I went to walk my cat
INTO JAPANESE
そうそう、猫の散歩に行きました
BACK INTO ENGLISH
Oh yeah, I went for a cat walk
INTO JAPANESE
そうそう、猫の散歩に行ってきました
BACK INTO ENGLISH
Oh yeah, I went for a cat walk
You've done this before, haven't you.