RF...did you say he's a Pug?...They are usually loving companions from what I've heard.
I have had and fostered many,many dogs in my time...rescuing some, though now I only have the one gentle Samy mix I rescued from the Lex., Ky pound years ago.
My daughter has had a Jack Russell for many years now, and he was a handful as a pup (as this breed tends to be)...very destructive. She would throw him on his back in the submissive position when he misbehaved, until he got the message that he wasn't "alpha" dog.
I agree with others here that pups have very short term memories, and there needs to be some unpleasant consequence to the biting, and immediate. A smack on the nose, or even a rolled newspaper threat would not be too cruel, since he's hurting you, and you don't want him to grow up thinking it's okay to bite. Also, follow this with promptly throwing him on his back and holding his neck...like Dog Whisperer does with unruly behaviors!
Patty