I am a believer in the dominance theory. I had a Great Dane and he was such a good dog. He would not go through a door until I got out and gave him a command. He waited for a command before he ate his food, or took a treat. Also, he wouldn't get his food until after his walk, that way he felt like he earned it.

I found this list of some behaviours that may inidicate dominance:

Pushing through doors, inside or outside, before you. Jumping or reaching for food or treat before it is put down or in reach.

Putting his or her feet on you, standing on or pawing at you.

Barking at you when told to do something or when he or she wants something.

Trying to be physically taller than you.

Getting on furniture before you or before being given permission.

Reluctance to move from a spot you want to sit on, walk through or put something in.

Reluctance to release food or toys.

Staring at you; prolonged eye contact except when you ask for it in a training or working situation.

Reluctance to obey simple, normal commands such as sit, go-out, get-off, etc. May be a refusal or slow compliance.

Marking (urinating or defecating) in house, marking your personal belongings or bed.

Running into you or jumping on you hard during play. This is a display of physical superiority and rights.

Growling or barking at you during play.

Sexual behaviors, such as mounting, with an inappropriate partner.

Putting her or his head on or over your head or shoulders.

Holding chews or toys against you while chewing or playing with toy.

Any attempt to shove you out of the way when walking, sitting with, moving past or laying with you.

Mouthing you at any time, any placing of her or his mouth on you whether in protest, during play or during petting.

Eating before you.

Not accepting petting or touching on top of his or her head or body.

Getting playful or cute instead of obeying when told to do things. The dog may obey briefly and immediately resume previous behavior.

Guarding food, toys or locations that they see as theirs.

Nudges your hand, mouths your arm, or insists on being petted or played with—in other words, he "orders" you to obey.