YOU SAID:

my dog went for a walk but ate my cat

INTO JAPANESE

私の犬は散歩に行ったが、私の猫を食べたが

BACK INTO ENGLISH

My dog went for a walk, but he ate my cat.

INTO JAPANESE

私の犬は散歩に行きましたが、私の猫を食べに行きました。

BACK INTO ENGLISH

My dog went for a walk, but went to eat my cat.

INTO JAPANESE

犬は散歩に行ったが、猫を食べに行った。

BACK INTO ENGLISH

The dog went for a walk, but went to eat a cat.

INTO JAPANESE

犬は散歩に行ったが、猫を食べに行った。

BACK INTO ENGLISH

The dog went for a walk, but went to eat a cat.