I've never worried about the occasional flea bite. We have mosquitoes and ticks where I live too. A dog outside is going to get the occasional bug bite. It's just a fact of life in my neck of the woods. Where things become problematic is when there is a flea infestation, not just an occasional bug. Treatments like Nexguard and Frontline should prevent an infestation from taking hold inside the house.
I don't like to spray pesticides outside, not even natural pesticides, except as a last resort. I'm very protective of the native bees in my yard. Many are burrowers, so they would be unable to avoid anything I spray on the ground. They are harmless to me and helpful to the environment. (The charismatic honey bees everyone has been so worried about lately are an imported species; North America got along just fine without them for millions of years. The little furry solitary guys are the important pollinators in our native ecosystems.)
I don't like to spray pesticides outside, not even natural pesticides, except as a last resort. I'm very protective of the native bees in my yard. Many are burrowers, so they would be unable to avoid anything I spray on the ground. They are harmless to me and helpful to the environment. (The charismatic honey bees everyone has been so worried about lately are an imported species; North America got along just fine without them for millions of years. The little furry solitary guys are the important pollinators in our native ecosystems.)