YOU SAID:

the cat had the cat were cat had was now dog

INTO JAPANESE

猫は猫を飼っていた猫は犬を飼っていた

BACK INTO ENGLISH

The cat had a cat The cat had a dog

INTO JAPANESE

猫は猫を飼っていた猫は犬を飼っていた

BACK INTO ENGLISH

The cat had a cat The cat had a dog