Hello. I live in Chandler AZ and have a shady grassy back yard. I am thinking of getting a few hens. However, I have a German Shepherd and a Bull Terrier. And I have feral cats out front. Concern for how dogs will react to hens. Advice re/ training dogs, and secure coop? Hank the shepherd is a rescue and I know he dug out of his ranch in Vegas and chased neighbor's goats. But if I go out front to get paper with him off lead and say "no kitty," he will stop one foot from a cat and stare hard but not go after it. But would want coop he cannot break into...