I have never seen this before. I had a healthy fawn who is now about 2 months old, 3 weeks ago I noticed his jaws were puffed out. I have dealt with Lump-Jaw. I could see from a distance that he prob had grass or grain packed between his cheek and jaw. I darted the fawn and sure enough, it had grass and grain packed in its lower jaws. I pulled out a big clump of chewed up food and rinsed his mouth out, wormed him and gave him some antibiotics. The next day he had his jaws puffed up and full of grass again. Sometimes he gets rid of it ( I can tell by looking) and the next day it is full again. He is starting to have a rough coat and is falling behind the other fawns in size a little. Tooth problem? I have no idea what to do for him, but I don't see him thriving if he continues to do this. Darren