Ever since we have had Rosie she has had a small, belly-button like lump on her chest. It doesn't seem to bother her, but recently its started to get really red and seems to get bigger but then it shrinks again a while later. I'm sure it's not a belly-button as it surely it should be further down, and our other two don't have one. And then the question cam eup, do dogs even have belly-buttons! Any ideas as to what it may be, we do want to avoid a vets appointment if possible!