Hopefully it is just a lump from a recent vaccination. I usually go into a panic mode until I realize what the cause it. Sometimes it doesn't show up for a couple of days and by then you have forgotten about the shot. Scares the bee-gee-bees out of me.
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Joanne

Eli

Chipper

Eva

Snowboy

Rosie(R.I.P. 1996-July 29, 2013)

Cocoa(R.I.P 1998-April 26, 2012):