YOU SAID:

When I went to store, I lost my dog who isnt my cat

INTO JAPANESE

私が店に行ったとき、私は私の猫ではない私の犬を失いました

BACK INTO ENGLISH

I lost my dog not my cat when I went to the store

INTO JAPANESE

店に行ったときに猫ではなく犬を失いました

BACK INTO ENGLISH

I lost my dog, not my cat, when I went to the store

INTO JAPANESE

店に行ったとき、猫ではなく犬を失いました

BACK INTO ENGLISH

When I went to the store, I lost my dog, not my cat

INTO JAPANESE

店に行ったとき、猫ではなく犬を失いました

BACK INTO ENGLISH

When I went to the store, I lost my dog, not my cat