I would be interested in ideas here too... Callie won't sit still for grooming either. It is a battle with a wriggling 55 lb dog from start to finish. SHe isn't hostile about it, but simply won't settle - she grabs for the brush, wiggles, etc. I suppose I can be grateful that she's an F1 with a fairly straight coat... if this were a wool coat, we'd be in trouble by now!
We bought a really simple cheap brush at walmart. It has a pin like brush (like I would use on my hair) on one side and a smoothing brush on the other. I agree w/Gene - it helps to have a partner. My husband will hold a Kong while I brush (sometimes). Other times I will put a leash on Dexter and wrap the other end around my leg. He is getting much better as he gets older, but he still doesn't like it.
Make it a pleasant experience...keep your brushing sessions short at first and give lots of treats.
shaia hated being groomed when she was a puppy. but i groomed her every day despite to get her used to it and offered lots of praise and lots of treats!! i'd just grab her collar and persevere! i really think that every day brushing helped her get used to it - she stands still now! also, i think the brush was too stiff - maybe a softer brush would help?