Tea tree oil will kill fleas, on your dog immediately, when mixed with baby shampoo. Leave it on and lather well, and most if not all the fleas will die, and wash out. This will not prevent the fleas from returning. You have to use a collar.
Will Ted's mange cure work on fleas?
For fleas - rub your pets with waxed mrytle leaves, then throw some small branchs of leaves behind furniture and in front of your return air handler. Fleas, mosqitoes and ticks do not like the smell and will find their way out of your place. It is a wild evergreen that can grow to 18-20 foot. Some people will have a skin rash if they touch it. It has a light evergreen smell but does not look like an evergreen tree it has leaves. It grows along ditchs and in dry areas. If you crush the leaf in your hand and it smells evergreen you found it.