If you dream of a tiger, its dream interpretation is likely to be a warning of a threat. This is because the tiger is a carnivore, and destroys other animals.
If you dream of yourself as a tiger, you have an identity issue. You are out of place with your present human identity. Maybe you wish to devour someone. Maybe you desire to defend your territory.
If you dream of seeing a tiger, meaning you are not that tiger, then you need to be careful. Dream imagery of another person as a tiger means you are reminded of a threat to your well being.