YOU SAID:

I have a cat and a dog and a horse

INTO JAPANESE

私には猫と犬と馬がある

BACK INTO ENGLISH

I have a cat, a dog and a horse

INTO JAPANESE

私には猫、犬、馬がある

BACK INTO ENGLISH

I have a cat, a dog, a horse.

INTO JAPANESE

私は猫、犬、馬を持っています。

BACK INTO ENGLISH

I have a cat, a dog, a horse.