I had 28 chickens, 1 is with my guineas because he thinks he's a guinea since he grew up with them, the rest was in my dogpen the past few days (I had to move them because of a mink so I've been tying my dog up next to them) but I've lost 3 chickens within a week and 2 in just the past couple days) we have a net above the dog pen with a hole in it, no diggin around the pen, no feathers, no blood, no body. No signs of a struggle. What could it be? My neighbor has the same problem but he let's his free range like I used to.