Fragile?
I've used a steel-tined comb I carry with me as part of my hunting kit, and take my time extricating weed seeds from my GWPs.
I've read of using PAM, a spray used for pans to make them non-sticky, but didn't want to spray something in my dogs' faces and nose.
I also trim my GWPs back a bit when season arrives.
Other folks have used Vaseline, lightly applied, if I recall correctly.
Best wishes.