[Dave-B]

Here are all the ways I say and teach possession going from formal to very informal:

I have a dog. Normal
I have got a dog. Slang, but common
I've got a dog. Slang, but common
I got a dog. Very informal slang


The one difference between Canada/U.S. and Britain is the question:

Have you any sugar?

We would never say this in North America. We would say, "do you have any sugar" or "have you got any sugar?"

A very quick and informal question that would be common could be this:

You got enough time?
You got any change for the bus?

Those are my thoughts....