YOU SAID:

I have 15 dogs and 7 cats and 3 gerbils and a bird

INTO JAPANESE

私は15匹の犬と7匹の猫と3匹のガービルと鳥を飼っています

BACK INTO ENGLISH

I have 15 dogs, 7 cats, 3 gerbils and birds.

INTO JAPANESE

私は15匹の犬、7匹の猫、3匹のガービルと鳥を飼っています。

BACK INTO ENGLISH

I have 15 dogs, 7 cats, 3 gerbils and birds.