I agree with the posters who suggest a digging barrier, electric fence and other barrier options. I wouldn't put down a dog for killing a chicken, they didn't ask you to get chickens and tempt them, they don't know any better. 
I agree that Ceasar Millan does have some great techniques, I've seen him stop dogs from killing bunnies.
	
		
			
		
		
	
				
			I agree that Ceasar Millan does have some great techniques, I've seen him stop dogs from killing bunnies.
	
  Our dogs are hunting dogs and I did worry that we may not have any luck teaching them to accept the chickens and cats but they're doing fine. I can even tell my 4 yr old to "love the kitty" and he'll rub his face against the cat's face and make her purr like crazy LOL 