that does sound like a bad experience. nala just got spayed 2 weeks ago, luckily we didn't have any problems. i like you wouldn't let her stay the night just so they could check on her in the morning. they didn't tell me not to give her any food, they just said give her a small amoutn of water and food and if she keeps it down then go ahead and feed her normally. she did fine and didn't get sick so didn't have to worry about that. i don't understand why he would pinch her stictches like that??
