YOU SAID:

I ate my dog for breakfast

INTO JAPANESE

朝食に私の犬を食べた

BACK INTO ENGLISH

I had my dog for breakfast

INTO JAPANESE

朝食の私の犬を持っていた

BACK INTO ENGLISH

I had my dog ​​at breakfast

INTO JAPANESE

私は朝食で私の犬を持っていた

BACK INTO ENGLISH

I had breakfast with my dog

INTO JAPANESE

私は犬と朝食をした

BACK INTO ENGLISH

I had breakfast with my dog