Thanks, Jax!
I know a groomer could do it, but I have a music teacher friend who has three hairy collies and border collies, and she shaves them successfully each summer. Kelley is so good about standing still, that if I could get a good pair of clippers, with the attachment not to cut her, I'm confident I could do it myself. However, if this last expensive pair I've ordered doesn't work, I'll take your advice and get her to a good groomer!
Patty