Join Date: May 2011
Location: Northern California
It sounds like she thinks brushing is playtime, and 5 month old pups can be pretty bratty! Have you done any puppy obedience classes with her? She should have had all her vaccines by now, so it should be safe to get her enrolled ASAP. Teaching obedience will help tremendously when you want to get down to grooming.
Can you invest in a grooming table, arm, and loop? Once the dog is up on a table with her head in the loop, her movements will be restricted and it will be easier to control her. Table train her first by giving her treats just for standing there. Pet her all over and make the table a GOOD place to be. When she's to the point where she'll jump on the table by herself and stand there quietly waiting for treats, you can start to introduce the brush. Gradually at first, a few brush strokes, then treat. Make sure her head is placed high enough that she can't whip around and bite you. Eventually, if you are gentle but firm, she will accept being brushed.
I'm a professional groomer, and I haven't yet encountered a dog that did not learn how to tolerate being brushed. Some of them love the attention and the touch, others never really seem to enjoy it, but all of them learn to accept it eventually. Good luck!