Why Do Police Shoot Dogs During Raids?

Five police officers were attacked by a dog during a raid by a "pit bull" type of dog. Apparently the injuries were serious for 4 of the officers.

My thoughts:

1.) A "pit bull" type of dog could mean anything. We've seen this before. It could have been any breed or any mix of breeds. I hate it when reporters do this kind of reporting. They had the ability to find out who did the raid (police), what they were doing (a raid), where they were doing it (London), what happened to the police (4 injured seriously, one somewhat injured), who was arrested (a 20 year old man)... yet the focus of the story, the main point of the story... about a dog that bit them... we know next to nothing and apparently no effort was made to figure out anything about the setup, what kind of dog, what was the setup for the dog bite, what happened to the dog, and so forth. It's just lazy, sloppy reporting. 

2.) If strangers break into your home with violent intent, and that is what the police officers did, then this dog didn't do anything wrong. The bites, though unfortunate, were justified. I hope this dog gets a good pat on the head, and if it has a stable temperament, is adopted by someone else.

3.) If you are a criminal, your dog isn't going to stop the police. Most times, the police come in and shoot all the dogs in their way. The dogs die because of your criminal activities.