About a month ago I noticed that my male black lab, 2.5 years old, had a nipple that was a tiny bit larger than normal but it wasn't much larger or discolored, so I didn't think much of it. Yesterday after a long weekend of pheasant hunting I noticed that it was maybe 3x the size of a normal nipple and bright red. It looks like a mole, or zit or something, I tried squeezing it thinking it would pop, it did not. It doesn't seem to bother him at all, even while I was touching it. I tried taking a picture of it, but if I turned the flash on on the camera then the light just bounced off and it was a white glowing picture, if I did not have the flash on, then it was just a dark picture.
Any thoughts? I know it is hard to tell without seeing it in person or even a picture.