I have something killing chicks. I have about 40 chicks in a pen with 2 ducks. The ducks are the same age as the chicks. The chicks are 8 and 9 weeks old. I found two polish chicks dead yesterday and then I found 1 Brahma dead tonight. Nothing is missing on them, no holes that I can find or anything. I found one Silver Leghorn in the yard dead today too. I have 9 week old puppies that had the little Leghorn. I'm not sure if they could be my problem or not because if they are I have no idea how they are getting in and out of the pen. All of they other chicks have been found in the pen dead. Any ideas would be great.