I believe that more training on dogs and their "signs" and breed tendencies is not a bad idea for LEO. That being said, I worked over 15 years in a large, unpredictable metro area and I have been "rushed" by dogs before both with and without LEO presence and not one time did any one shoot a dog. The one time our firefighters wanted to call LEO to shoot a dog, I was able to look in and see a Irish Red Sitter running around and "Happy" barking and wagging his tail so hard he darn near fell over. Knowing the breed and the way the dog presented, I opened the dog...commanded the dog into the bathroom. He complied and I shut the door and treated our patient.
It is a sad occurrence when a pet is killed, especially when it is not necessary, but is it really a out of control issue?