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Originally Posted by YorkieAunt  As far as I know, it is how the dogs communicate with each other. All dogs have anal sacs back there and it is their personal scent. When they smell the scent, they know who the dog is and if it is friend or foe, male or female, alpha or submissive. |
This is my understanding for the reason too. I was told by our trainer that it is the dogs way of greeting each other. We had to practice this in our classes, lead the dogs around to let them greet each other. It's part of socialization.