YOU SAID:

They're there with their dog

INTO JAPANESE

彼らはその犬と一緒にいる

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They are with the dog

INTO JAPANESE

彼らは犬と一緒です

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They are together and the dog

INTO JAPANESE

一緒にいると犬

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Together with dog

INTO JAPANESE

犬と一緒に

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With a dog

INTO JAPANESE

と共に

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"[とともに] /(exp) (uk) together with/as X, then Y (e.g. as we age we gain wisdom, as wine matures it becomes more valuable, etc.)/"

INTO JAPANESE

と共に

BACK INTO ENGLISH

"[とともに] /(exp) (uk) together with/as X, then Y (e.g. as we age we gain wisdom, as wine matures it becomes more valuable, etc.)/"