I have five Delaware pullets that I ordered from Ideal and they are big, non-aggressive and beautiful. I also have a Roo and another hen that I hatched out last year from eggs purchased from a breeder on ebay. They are wonderfull birds as well. I ordered another group of 25 chicks from Ideal...
I am so sorry, it's heart breaking. I face the same threat daily. I love my dogs but dogs will be dogs, they are just doing what their instincts tell them. I have very few predator problems because of the dogs but if they get out of their dog yard they will wipe out several chickens before you...