The first thing is this:

She should hire a professional dog trainer/behaviorist to work with her on behavior modification techniques. Getting info on a message board is hard because no one can clearly evaluate the dog and see what is going on in the home setting. Dog language is very important and can't be seen on a message board.
Also, the first step is always ruling out anything medical. Getting a clean bill of health first from the vet is always recommended. Drug therapy could be recommended.

The dog obviously is clearly not viewing your female friend as the leader.
She needs to practice NILIF as her "Daily doggie Bible".
The dog can CLEARLY see her fear..... which is not good. By your description, he is a very dominant dog.

She should begin feeding him (and making him sit/stay before she releases the dogs food) she should also begin making him sit/stay at the door until she releases him thru the threshold.
Basically, all his daily requirements should be coming thru her.
What type of collar does he have on when he is taking over control of her and she can't get him back in?
A correction collar will be helpful.
What happens to him when he comes into the house? My guess is he is expecting something negative to happen.
Try playing a game of Catch ball, Frisbee, etc... before he comes in and get him tired.
Also, teaching a strong recall is highly recommended.
Here is something else that can be tried. You get the dog to do what you want but do it in a fun manner. Learning occurs in an inquiring, cooperative, atmosphere.

Here is a training game I wrote and dogs LOVE it.

It exercises their minds, teaches a recall and burns off excess energy.

The triathlon Dog Training Game:

This is a great obedience training tool that is used Three Ways.
1) Mentally stimulate your dog

2) Exercise your dog

3) Teach your dog a strong recall (come)

Tools needed: 26 foot “Flexi brand retractable leash”

Fanny pack & Dog training treats, & fresh water available for you and your dog.

The triathlon game should be done daily before your dog goes out on a leash walk.

The idea is to use up any pent up energy that the dog has and to mentally stimulate as well as teach come to your dog all in one exercise.

Begin by taking your dog for a long relaxing walk using the flexi leash let the dog have fun running around. Each time the dog gets to the near end of the leash, call out the command "EASY". The dog will soon realize that he needs to slow down when you call out” Easy” because this command means he is getting to the end of the line (this may take a few times of the dog pulling at the end of the line to realize this so dig your heels into the ground deep)

After first doing this for about 5 minutes or so, your dog will have burnt off excess energy and begin to learn where the end of the line is and you are ready to begin:


Have your dog sit directly in front of you.

Say “Good Sit” & treat.

Next teach your dog “Watch Me”

(See below how this is done)

Watch me:
How to Teach the Watch Me Command:

Take whatever reward you are using.

Food is easiest to work with for this command. Stick the treat either near your mouth or up by your face.

If the dog already knows sit, Ask the dog to sit, once sitting in front of you,

Say, "watch me" As soon as the dog looks directly into your eyes, ... "Say Good Watch me" INSTANTLY high praise, & treat!!!

(This command becomes important to keep the dogs focus on you instead of elsewhere, and can be a big help in crowded area's where the dog may be overly excited or anxious)

After your dog has done Watch me,& has been rewarded, throw out a treat or ball and say to your dog “GO FETCH”. (Make sure the flexi leash button is open and not locked).

Let the dog fetch the treat or ball.

Next, you run backwards, and say, “Come”. If the dog doesn’t come, use your flexi leash like a fishing pole and reel the dog towards you.

Once the dog is front and center to you, say, “GOOD COME” and treat and praise!!

Keep on repeating this game for at least 10-15 minutes to tire the dog out. Try doing the game in different locations so the dog gets used to distractions. Begin this game in an area that has the least amount of distractions and gradually move into greater amount of distraction areas.

When the game is over and the dog is tired, try high pitching the voice up and saying Come, the minute the dog decides to come on his own, "GOOD COME" JACK POT REWARD and HIGH PRAISE with treats, praise etc... Let the dog know that this behavior is highly rewarded.

Thru leadership, knowledge, obedience and patience it sounds like the dog may have hope!

Susan