FYI, small dogs can succumb to flea bite anemia quickly. A tip for ridding your home of fleas-get several large boxes of baking soda and cover your carpet with it and under all furniture that sits on your carpet ( beds, dressers, sofas etc...) leave it in the carpet for at least 1 week without vacuuming then the day before you vac each time put more down. Fleas have a very thin shell and the powder will scratch the shell , the fleas will then dehydrate & die. Also the baking soda will get on the dog & keep the fleas off. Totally safe & Non-Toxic for your pets. You can use a broom to sweep it into the carpet so it doesn't look so bad till you can vac . Also do not vac it up where you put it under furniture, no one can see it there anyway and it will keep the fleas from hiding out there.
Also I would not trust any flea med that doesn't come from your vet as it can and Often does Poison your pet.