Cosmo is a 5 1/2 year old Cav. I just found a pea sized lump on his left hind leg near his knee. It's reddish in color and resembles the shape of a raspberry. Anyone else ever have/see this? I'm wondering how nervous I should be about it. When I touch it it doesn't seen to bother him. He is the Blenheim one in my avitar (The big guy).

Thanks!!