An
assertive dog is one that is confident, self-assured, and shows a strong personality. They may be bold, outgoing, and easily take control of situations.
Full definition
It requires an experienced, active, and
assertive dog owner (you, not the dog, need to act as a pack leader).
When well trained, the Weimaraner is a confident and
assertive dog who makes a wonderful companion.
It's time to start saying that your breed is
an assertive dog that works aggressively, so that people can distinguish the difference, or we will not be far away from the day when we can no longer enjoy the breed we love.
Other situations result from a mismatch in personalities...
an assertive dog with a permissive owner.