[MARYDVM]

The fatty omentum acts as a plug to close any small wound that penetrates the abdominal wall. I recently saw a feral cat that had been spayed and released that showed up 5 days later with a huge wad of omentum protruding from where her incision had been licked/chewed open. She was in amazingly good condition, and recovered after a second surgery and heavy antibiotic treatment. However, once you have an opening in the abdominal wall bacteria can get in, and abdominal organs may come out. I have also seen a dog totally eviscerate after a spay incision opened up - intestines dragging on the ground as she walked. That dog didn't survive. So it's possible your girl could have been fine for another 24 hours - or not. Resuturing the incision ASAP was the correct medical recommendation.