YOU SAID:

the dog is the smallest and it eats the bread; but not the cat

INTO JAPANESE

犬は一番小さく、パンを食べます。しかし、猫ではありません

BACK INTO ENGLISH

The dog is the smallest and eats bread. But not a cat

INTO JAPANESE

犬は一番小さく、パンを食べます。でも猫じゃない

BACK INTO ENGLISH

The dog is the smallest and eats bread. But not a cat