My Labradoodle has also started getting very protective/aggressive. He is 2.9yrs old.It is so sudden that we often don't have time to react. It is so shocking as he is such a normal, clown like, passive temprement - other than when he is at the local pub sitting with us in the garden and he sees another dog walk by he goes beserk and snarling. We are now taking a small sports type water bottle with us(it has a squirty cap) and if he starts being agressive we squirt him on the nose/face with the water. This shocks him out of it and he forgets what he was doing. We say NOTHING when we do this so he doesnt assocciate the action with us and he doesn't know where the water has come from but its enough to snap his focus. Try it, you may find it works long enough to break him of the habit! Good Luck Barbara Robbins
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