I'm not sure what to do with my yard. It's so flea infested and my new puppy is miserable. She's been on Revolution which has been a complete waste of 80 dollars. I have to soak her in water and pick fleas off every night. I have to do something with my yard but I don't know what. I used Sevin to no avail. I have tons of plants and chickens that I don't want harmed. Any advice?