I hunted and trapped coyotes for several years to sell the pelts. I never once encountered any fleas nor did I ever get fleas in my home or on my dogs from the coyote pelts. I streatched and dried the pelts before selling them. For that process, after I turned the hides inside out, I had to flesh the pelt, and put the pelt on a stretching/drying frame.
BTW, now I tan the pelts myself. It's easy to do and worthwhile to do it. I learned how at
Rabbitstick.