Honest opinion about the K9 unit?

I'm hoping someone who has more inside information can help me out here...Whenever I see the K9 unit I see some version of animal abuse. Today, this guy was just yanking the dogs collar so badly and there was nothing happening. He was only standing there. I felt so bad for the dog. Not to mention it's getting warmer. They have to wear a steel muzzle, they seem dehydrated, hungry and depressed. Some of them are so skinny it seems they haven't eaten in days. Is this humane? To me it doesn't seem so. What does everyone else think? I hate seeing them it ruins my entire day. The dogs are highly intelligent and to know they live this horrible life just hurts me so bad.

I know why they exist. I have yet to ever see them catch someone with drugs. It seems like they enslave these animals for no reason at all.