Have 2 gorgeous dobermans - aged 7 (female = dominant and her brother v v submissive). Both extremely well socialised, love people, children, babies and other dogs. Every now and then and completely out of the blue, our girl Sasha will run up to a random dog and bark .....now sometimes it happens IF the other dog is nervous/anxious and the owner is the same (not sure if that's the reason) but other times it is for no apparent reason whatsoever. She always stops about 3-4 metres from the other dog then comes running back. Any ideas welcome please!!