Hey Mini, I tried to load the video, was curious to see what this guy's backyard looked like. Unfortunately this darn dial-up has decided it doesn't want to load the video.
The police had every right to shoot the dog in order to protect the K9 dog. I don't believe in tasering a dog (depending on it's size), as tasers don't do much. Before the Pitbull ban in Ontario, there was an incident where two aggressive Pitbulls were running loose, terrorizing a neighbourhood. I recall in the news that an officer shot one of the dogs 14 times before it died. Just to give you an idea of the adrenaline some dogs can have. IMO, tasers don't always work and should not be used in situations such as the police officer's dog either.
But in a way I feel the officers were in a way a small portion responsible. In that if you notify the neighbours of previous times of when you're going to be doing your training, then that is what people are going to expect each and every time. People forget that officers are only human too and do make mistakes. This was a miscommunication problem that day on their part. But the owner of the dog, knowing the bad media this breed receives, should have used his marbles God gave him, and been responsible by having a completely enclosed fenced in area for his property. Allowing the next door neighbours child to play with this dog, which I'm assuming (I know I shouldn't) unsupervised is an accident waiting to happen. Dogs will be dogs, and kids will be kids. If there is fencing, then it should have been a privacy fence, no shorter than 6 feet in height, with signs posted on the fence "dog on premises" and "no trespassing".