The bull seen in your dream symbolizes undertaking a task you intend to do with great ambition and determination and being successful. Seeing a bull chasing you in your dream is a warning that you should pay attention to your health.
Seeing that you are in a bullfighting arena and bulls being fought indicates that a youth event will happen to you again, you will relive a similar adventure that happened many years ago and you still carry the memory in your heart, and this event will make unexpected changes in your life. It does.