If a dream tells us about future events, how likely is it for those events to happen?

I've read a lot of dream interpretations on http://www.myislamicdream.com/ . A lot of them tell the dreamer about the events of the future. If a person sees something in a dream and its **interpretation tells him something about the future, how likely is it for those events to happen?** **Is the dreamer bound my fate to suffer from what the dream told him/her? Or can the dreamer avoid those events from happening?** For example, the website explains that "Falling in a blood well means the dreamer will be unfortunately involved in a crime or plagued with illicit money". Now, it is only sensible for the dreamer to try to avoid this outcome at all costs.