Ivins writes: Do you know how to cure a chicken-killin' dog? Now, you know you cannot keep a dog that kills chickens, no matter how fine a dog it is otherwise. Some people think you cannot break a dog that has got in the habit of killin' chickens, but my friend John Henry always claimed you could. He said the way to do it is to take one of the chickens the dog has killed and wire the thing around the dog's neck, good and strong.