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You can probably find some as fleas are pretty adaptable but in general they prefer a warm moist environment to reproduce and the dryness of the desert really limits them.
While there might not be a lot of dog and cat fleas they do show up infesting rodents in the area so they do exist in the environment.
Hope this helps you!
30+yrs pet vet care & nursing, rescue, behavior & training, responsible breeding, small animal care