I agree with everything that Carrie said, and I have a few more suggestions which I got from books and learned from people on Pet Talk. I've had to use some of them on occasion. Max has been grounded a time or two.

One is to feed every single morsel of food to him by hand, and make him do something for it. Like make him sit nicely while he eats each piece, one at a time, from her hand. She doesn't have to feed it all in one sitting - she can use it as treats throughout the day. That will do several things. First of all, it will show him that all good things come from her and make him really want to please her. It will establish that she's alpha. It will also help take care of any food dominance issues.

Another is to ground him until he learns to behave. Have her make him do at least 50 downs a day. She can use his kibble as reward, as well as affection etc. Tell her not to do anything at all that he likes without having him down for it. He wants to be petted? Down. He wants to go outside? Down. He wants to eat? Down. He wants the ball? You get the picture. When he submits and learns to behave she can let up, but he'll relapse and then she'll ground him again.

Please have her try these things, as well as the things everybody else suggested, and then tell us how they work out! You know - dominant dogs might be difficult to control at first, but once you get them under control they're just wonderful pets. I actually prefer the dominant dogs. They seem to me to be more intense and a lot more fun.