Dianna Hurst, Texas 7/29/2013 9:19:43 PM I'm reading everyone's posts because I have a 6 yr old dachshund who has a lump at the bottom part of his breast bone or rib cage. There seems to be a spot on the top part of the bump that could resemble a bite, maybe small spider or a bee sting. The bump moves slightly and is firm but not hard. I was really worried before I started reading up here. But now, thanks to all of ya'll I realize there could be a number of different things it could be. So I'm not overly worried, but now I am concerned and will pay close attention for any changes. And I can put my son's mind at ease. I want to say thanks to everyone who participates because you never know who or when (2 years later) you will help another dog lover.