To dream of a leash represents control and restraint. Needing to feel yourself keeping control over a person or situation. Taking the lead. Not wanting someone to get out of control or go overboard. Keeping your influence over someone.
Example: A woman dreamed of having a bulldog on a leash. In waking life she was intentionally ignoring someone who gave her advice with a problem because following the advice would have required her to moderate her behavior when she didn’t like that. She feared listening to the advice and instead choose to show off to the person giving her advice by intentionally increasing the behavior she was advised to moderate.
Example 2: A woman dreamed of having a lion on . In waking life she was trying very hard to control her alcoholic boyfriend because he had a very bad temper.