YOU SAID:

i am gonna go walk my dog outside

INTO JAPANESE

外に犬を散歩させに行きます

BACK INTO ENGLISH

I'm going to take my dog for a walk outside

INTO JAPANESE

犬を連れて外を散歩します

BACK INTO ENGLISH

Take a walk outside with your dog

INTO JAPANESE

犬と一緒に外を散歩する

BACK INTO ENGLISH

Take a walk outside with your dog