Answer:
I am the kind of dog that chases anything red. What am I?
I mirror your actions.
Lighter than what I am made of. More of me is hidden than seen. What am I?
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
When you take away the whole from me, there is always some left. What am I?
The answer I give is yes, but what I mean is no. What was the question?