On my shelties inner thigh, right on the edge (think of where her knee is, its straight above that) i found what i thought was a large mat, a large blister/bubble/sore/lump thing. Its about the size of a quarter and is soft/squishey to the touch. Its very raised. It looks bloody inside. I made a vet appt for friday, just wondering what everyone thinks it is... thanks guys Im really worried.