I had the same issue.. I candled the eggs and 3 looked dark, so broke the 6 eggs. 3 were bad but 3 had fully developed chickens that appeared to be dead, no movement and the embryo sack never broke.
I followed all the process in the incubator, checked the temprature and moisture regularily and...
I have had my Mini Fox Terrier for 12 months now. He is 2 years old. I introduced him to my chickens and everything was fine for a few months, until one day he chased two of my chickens and shook them. They both died. I now put him on the leash each time I let my chickens come out of the coup...