there are the whisper "woof"s to get my attention. If those fail it turns into a full-on corgi bark.
there is the familiar corgi "whine & wiggle" used in numerous circumstances.
It's usually used as a "please", as in "please may I come up on the bed now?"
There is a little growl if he is disturbed whilst in a comfy position.
but our favourite is the "silent sass". We are sure he is mouthing some smug remark. It is usually preceeded by a scolding remark or glare from one of us...