I have a Chow German Shepard mix & a Lab both are outside dogs. In the summer months we had a problem with the biting flies, which causes bad sores on my dogs. I used (ACV/Water)1 cup of apple cidar vinear to 2 cups water sprayed my dogs every other day and it helped a lot. Don't spray on open wounds.
I also have 2 small dogs and a cat inside the home that have fleas I use 70-90% full strength rubbing alcohol put it in a spray bottle and spray the carpets and all cracks and crevices of floors (carpets and tile) not good on wood. Not good around birds, I saturate one room, close the door and then go to next room.
* Put birds in a room that isn't being treated.
** Do not stay in the sprayed rooms leave until carpet/floor dries.
Once I had a flea my arm and ankle I spritz the area with the alcohol and the flea died instantly.
Rubbing Alcohol for Flea Infestations
We had an absolutely horrific flea infestation on the entire second story of our house (which is uncarpeted, thankfully) and were disappointed by the 20+ flea bombs that failed to kill them, so having heard this from my mom, we filled spray bottles with straight Rubbing Alcohol (just the regular, cheap stuff from any store) and went crazy. We soaked the floor and about two feet up the walls. It worked great, and I mean, GREAT!!! You could watch them die within seconds. Just be sure to open as many windows as possible to provide lots of ventilation while you work; we didn't think it would be safe to use it on our cats or let them (or anyone) in the area for a few weeks until it aired out really well. Oh, and we also laid out ALOT of duct tape (sticky side up) to catch any survivors, of which there were very, very few.