Long story short. My dogs were attacked twice last year by the same dog. The owner denied to the police all allegations. No witnesses. There were several of the same breed so you couldn't say which one it was. They have four but only ever walk two at a time. They have attacked other dogs, bit a neighbour and caused a guy to fall. If I find those dogs darting towards mine and u called them to recall, would it be OTT if I use a dye spray to defend my dogs if they get too close.