To see a bull's eye in your dream represents your search for perfection. It may also mean that you will achieve the goals you have set for yourself.
To dream of a bull represents an aspect of your personality that is stubborn or headstrong. You or someone else that is obstinate. An unyielding desire to have what you want and have your way.
A bull can be a sign that you are dealing with powerful instinctual urges like lust, sexual desire, or anger. A personality trait that is "bullheaded." You may need to learn to compromise or practice restraint in a situation.
Example: A man dreamed of an angry bull inside his house ramming his door to get outside. In real life he was attempting to endure a long cycle of sexual abstinence that was very difficult to stick with. The bull may have reflected his powerful sexual desire that was difficult to control as his urges became too strong.
To dream of a person or creature with horns represents your awareness of others negative or evil intentions. It may also reflect some aspect of yourself that is behaving this way. Unwanted sexual aggression.
To dream of yourself having horns on your head represents your awareness of yourself being totally consumed by yourself. Doing whatever it takes to get what your way. It may also reflect awareness of your total absence of morals to achieve your goals. You are "pure evil" in winning. Preferring or enjoying total negativity. Awareness of your own negative intentions. Enjoying getting away with being arrogantly powerful over others. Evilly outsmarting others.
Alternatively, dreaming of yourself having horns may reflect awareness of your own sexual aggression.