The ritual signals at meetings between them are subtle and often of short duration, and that permit social activity most immediate. The first meeting between two subordinated dogs are fairly relaxed, and the meeting result either in play or in relaxed listlessness. That's why we easily understand what they say to each other or to us. Even the most dominant dog must show resignation in relation to people in its flock. Submissiv but satisfield.
Many dogs submit in a relaxed and contented way to their leader.
Under these circumstances it's only the dogs which have very much of dominance that obtain their purpose with aggression. This behaviour are of rare occurrence in the Collie breed. Afterwards they have urinated or have had faeces some dogs kick away the dust or grass just to show visible tracks. This behaviour can cause problems too. Dogs sometimes can aggressive defend their territory in not convenient occasions, for example when we are leaving them in the car.