I lost over 20 quail at the beginning of this spring. Dogs literally chewed through my wooden fence in the backyard and then through the wood framed pens, they pulled the hardware cloth off with thier teeth after splitting the wood. It was insane. Even when we think we have everything secure things get through our defenses. I have developed the mindset that in keeping prey animals, I will have losses. It doesn't hurt any less, but it helps keep things in perspective. And as others said , you learn valuable lessons when it's painful. I still very sorry you lost your little peeps