YOU SAID:

I am going to the store and then I will walk my dog.

INTO JAPANESE

私は店に行ってから犬の散歩に行きます。

BACK INTO ENGLISH

I go to the store and then walk the dog.

INTO JAPANESE

お店に行ってから犬の散歩をします。

BACK INTO ENGLISH

After going to the store, I walk the dog.

INTO JAPANESE

店に行った後、犬の散歩をします。

BACK INTO ENGLISH

After going to the store, I walk the dog.