In Alabama if an intruder is doing as much as HOLDING a knife while in my house I can kill him. Weapon isn't even necessary, force up to and including deadly force can be used against someone unlawfully in your home. Haven't read the article yet, was merely a response to your post.
Now, in response to the article, aren't police dogs considered officers? If that's the case then killing a police dog would be the same as killing a police officer and would warrant the use of deadly force.