I think its because Dax is teething...but his breath has been terrible the past few weeks. Is this normal with teething pups? I dont remember our other dogs having breath like this...and it seemed to change when he began loosing teeth. Anyway to fix this?

We experienced this. Just for a week or two her breath got really bad which was unusual for her. Our vet said it was probably just a tooth that was having trouble coming in. Anyway.. it went away shortly after. Joey never has bad breath its pretty refreshing.

Check to make certain there is no eating of other animals feces.  When in the field, Queen will nibble on cow pies sometimes.........whew, the breath gets awful.