CGG - I'm so sorry for your loss. Your birds were gorgeous! The print looks canine, though I'm not sure one could open the door. Last summer, a guy about 2 mi down the road from me (and downhill next to the river) had something break into his coop 3X and decimate the birds. Most vanished without a trace. 3rd night he saw it, and thinks it was a mink, (or maybe a martin or fisher). I did not think there were supposed to be any left around here, but we do border the Seattle Watershed, and that area is full of wildlife as it has not been open for hunting, trapping, or even hiking for nearly 100 years. About a week later, some of his hens were found wandering around up here ... 500 feet higher in elevation and 2 miles up the road! I'm hoping some of yours made it out alive and will show up again when they are a little less traumatized.