My cocker had bad matts in her armpits.. went to the groomer, and the groomer accidentally took a large chunk out of her while trying to cut out the matts.. Thankfully she covered the 730 bucks it cost for surgery, but I've been paro ever since.
Few weeks ago there were lumps under her ears, that were so tight-packed I thought they were part of her ear with cartiledge inside. Finally figured out they were awful matts. Took me an hour each side with kids saftey sissors to cut them down and out. I've decided to keep clipped down that spot and her armpits in future it scared me so badly. Had to have hurt like heck they were pulled so tight.
I felt like such a bad Mom, but I brush her often.. so it wasn't from not caring