thay have more than one option than just shoot the dog imo
the problem lies with the armed responce...its to much f*****g about for them to do out else.. ie geting a vet in to tranquilize the dog /getting a handler in....alsorts of scenarios .....the potential for it to go wrong could have been reduced greatly with a bit of thought....but that would take brains...and at the end of the day it all costs money.....f****n shame as the dog had done nowt wrong