I grew up with corgis and love them. Super smart and very powerful for their size. If you take the time to train them right you'll do fine, but as others have mentioned theyre not going to work against hawks. They do have a LOUD bark though, I'm sure you could train them to bark at hawks, maybe that would work? Train the chickens to go into shelter when the dog barks and you have a plan. Good luck, we are hoping to add a dog to our family sometime in 2012 too!