Panacur held on for five days after passing a dead kit. While she was eating, her weight did not improve so the vet was still uncomfortable doing surgery on her. Last night she was showing signs of discomfort so I pushed the surgery. Obviously, the antibiotics had not helped. For those unfamiliar with pyometra (infection in the uterus), once an infection sets in, the only way to get rid of it is to do a spay. I was optimistic at first that I had gotten the head out in time before an infection set in. Last night, I checked her vagina since she seemed so uncomfortable and noticed pus coming out of her vagina. It smelled like an infection. So we pushed the surgery just to have her spayed. She came out of the surgery wonderfully last night and appeared to feel better. She was on pain medicine and antibiotics and took a good amount of lifeline from me. I continued to feed her and check on her throughout the night, but unfortunately...she passed on this morning. I don't know if the infection had just set in too deep or she had complications from the surgery, but she is out of pain now. RIP Panacur.