DS went out to move horses from one paddock to another and found my mare with a huge knot/abcess on her neck. Our horses range on 15 acres so we dont always see them up close everyday. In all of yesterdays busy holiday stuff, no one actually saw them up close. I saw them several times from the window on their range. So it must have happened late in the day on Wednesday or early yesterday. It is about the size of a golfball. It has popped open and I can see raw muscle/flesh in a spot about the size of a quarter. I cleaned it up really well and poured peroxide on it. Dh getting penicillin now. Anything else I can do to help her? Thank the lord it isnt fly season! What could have happened to her to cause this? Could my other 'witchy' mare have bitten her? Poor girl. Any suggestions for additional wound care are greatly appreciated!