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Canines jump on people for a variety of reasons. One of the most common is to greet a person. Dogs learn to do this when they’re puppies, so it is instinctive. Another reason is to display dominance. As pack animals, it’s a natural behavior for them to stand on their back legs and place their front paws on others. That communicates their place in the pack. A third reason is because they have been encouraged to jump in the past. This often happens when owners condition their dogs to jump when they are puppies.