Q. The right side of my chihuahua 's mouth has a knot and is swollen. It appeared last night and now it looks really saggy underneath her neck. Why?
DR. CHRISTIE LONG, D.V.M., C.V.A.
A. It's really hard to say, since I'm having a hard time picturing exactly what the problem looks like. At 11 months of age and in this area, it could be a problem with a tooth that's trying to grow in, a salivary gland problem, or an enlarged lymph node. If you'd like to do a consult you can send me some pictures and I can try to help more, otherwise I'd recommend getting this checked out by your vet.