Final answer:
Being angry at a professor but yelling at your dog is an example of Displacement, a defense mechanism where emotions are redirected from the original source to a less threatening target.
Step-by-step explanation:
Being angry at a professor but yelling at your dog is an example of Displacement. Displacement is a defense mechanism where an individual transfers their inappropriate urges or negative emotions onto a more acceptable or less threatening target. It is a method by which the ego defends itself against unbecoming impulses or harmful stressors by redirecting the emotional response from the original source to someone or something else.
In contrast to Displacement, Projection involves attributing one's own unacceptable feelings to another person, and Repression is the unconscious blocking of unacceptable thoughts or impulses. Sublimation, another defense mechanism, involves channeling unacceptable impulses into socially acceptable activities.