YOU SAID:

If dogs don't like cats, then why do they?

INTO JAPANESE

犬が猫を好きでないなら、なぜ彼らは猫ですか？

BACK INTO ENGLISH

If the dog does not like cats, why are they cats?

INTO JAPANESE

犬が猫を好きでない場合、なぜ彼らは猫ですか？