YOU SAID:

puppies look pretty ugly when they bark

INTO JAPANESE

子犬をするときにかなり醜い

BACK INTO ENGLISH

When the puppy is pretty ugly.

INTO JAPANESE

子犬はかなり醜いです。

BACK INTO ENGLISH

Puppies are pretty ugly.

INTO JAPANESE

子犬は、非常に醜い。

BACK INTO ENGLISH

Puppies are very ugly.

INTO JAPANESE

子犬は、非常に醜い。

BACK INTO ENGLISH

Puppies are very ugly.