Averted a potential attack. Tip.
I have used and trained Deja to a referee whistle as a second way for the recall and to, at the same time, deter rude dogs. Today was the first time I used tis technique to keep a potential aggressive dog at bay and it paid off.
Situation: playing Chiuckit on the beach. As she ran after the ball a medium/ large mutt came after her in a way that looked like he/she was not going to introduce itself in a polite way. I whistled loudly, Deja ignored the dog and returned with the ball. The dog in the mean time hesitated because of the noise but kept on coming. He finally returned to his owners when I kept on blowing the whistle and I made myself big and looking mean. Deja, just stayed with me. No harm done. Proud of Deja's stable temperament and her obedience. I always assume, when in doubt, that other dogs ignore their owners so I am being proactive. Feels pretty good.