YOU SAID:

Big dog is in the house

INTO JAPANESE

家の中に大きな犬がいます

BACK INTO ENGLISH

there is a big dog in the house

INTO JAPANESE

家に大きな犬がいます

BACK INTO ENGLISH

i have a big dog at home

INTO JAPANESE

私は家で大きな犬を飼っています

BACK INTO ENGLISH

i have a big dog at home