Bee... a weasel is okay in a camp (not in a house, of course) if you can train it to stay in a corner and not roam around. You have to make sure it has bedding or it will tear the heck out of any material and you can't leave any food or water around. If you set a stew pot anywhere at all, you have to put a good sized rock on the lid. And, if you feed it, you have to feed it in it's corner and be prepared to get a tad rough with it if it tries to roam.

But, they can be trained like that, and as long as they do their business outside, which they usually do, you'll never have a problem with mice or squirrels.

As for the dog, Shepherds don't normally have a ratter instinct and, more importantly, their keen sense of smell would explain why it stayed clear of the shoat... ever smell the musk of one? I found one caught by the foot in a rabbit slip once. I cut a forked stick and pinned it's head to the ground while I got it's foot free. After hours of trying everything I could think of, I put pine gum on my hands, which just made my stinky fingers sticky.