I wish the pups could stay out in the yard all night, but the breed is so fixated on their "master" they'd take it as punishment being forced to be out there without him. That and they're not really guard dogs- they herd. One afternoon Sadie alerted to a large group of deer moving through the back part of our property where it's heavily wooded. She took a few steps, got down in her stance and was going to go circle around them as soon as Big'ol gave the order. He called her back (she's such a good girl!!) and Jack the Dufuss never even noticed there were things to chase.
Oh I wouldn't dream of leaving pooches outside, I just wondered if you frequently saw deer, or if the recent presence of your dogs kept them wary. Deer can smell them. Even though Gidget sleeps in, I think she is out enough, making rounds, barking at noises, that the deer I know we have near here never come close to the house. I only see them sometimes along the very far edge of the pasture.