Weedwhacker, my dogs alert when they even smell something...do you think the DVR could be equipped with 'smell-o-vision'?
Claudia, Thinking of the critter footprints in the snow reminded me of something. (This proves I am getting old.
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The people who lived in the Okefenokee swamp had a method to alert them if any critters had entered their space. They kept the yard around the house completely free of all vegetation, having only sand. Each night just before retiring for the night, someone would rake the sand (think of a Zen sand garden). In the morning the first person awake would look out the window to see if there were any tracks in the sand. "Daddy, I think there is a big snake up under the house."
Okay, the whole truth is that the vegetation-free zone also meant there would be less insects in the house and lessened the risk of fire to the house. I learned this on a visit to the Chesser Island Homestead.