To dream of a rooster represents a "wake up call." Unexpected situations or realities that force you to think differently. Fearing the potential to lose out on something important. Feelings about an urgent need to change or be serious. It may also point to your own attempt to make other people feel the urgency to be serious. Scaring people away from being lazy.
Alternatively, a rooster may reflect something in your life that's disturbing your sleep. Parents or friends warning you that you are going to be late for something something.
Example: A man dreamed of seeing a rooster. In waking life he had experienced an friend annoying him with a phone call early in the morning waking him from sleep for something important.