YOU SAID:

there is a dog at their party and they’re having fun

INTO JAPANESE

彼らのパーティーには犬がいて、彼らは楽しんでいます

BACK INTO ENGLISH

Their party has a dog and they are having fun

INTO JAPANESE

彼らのパーティーには犬がいて、楽しんでいます

BACK INTO ENGLISH

Their party has a dog and they are having fun