I am horrified by the tone of this discussion, the way people who weren't there are piling in with derogatory comments and calls to involve the police, it's like mob rule. Getting shouted at in the park by people who are being protective of their dog is not a crime, however unpalatable it may be. This couple are very good people and their dog is seriously unwell. I don't know what happened but for goodness sake please stop all this mindless condemnation and apply some emotional intelligence.