Ashes and neem oil will kill everything from lice, mites, to fleas and ticks. I use it on ALL of my animals. The birds and goats use the neemed ash pile and then hunting dogs/goats/cats get sprayed with the neem. You just have to reapply like any other flea treatment. In about seven to ten days or so. Also, treat their living quarters as well.
I have done enough autopsies on my dog-killed birds to know that my free-ranging hens are worm free. They have never had a synthetic treatment of any kind. Only peppers, vinegar, garlic, onion, neem, ash, and other natural treatments.
Diatomaceous earth is good for external parasites and to keep bugs out of grain stores.
Say what you will, I know these treatments work perfectly fine. God made a plan and then man tried to mess with it. I will follow what I think the good Lord wants me to do with my animals. Its something we have done for successfully, in different states, for many, many years.
The wool has been pulled over the eyes on many people trying to make them think synthetic is the best and at times, only way to keep animals healthy.
Synthetic is cheaper and much easier than natural cures and treatments. Large-scale farmers went for the faster, cheaper methods and somewhere a long the way, they forgot the old ways.
It is easy to do when your family's bottom dollar and ranch is at stake because big ag. is breathing down your neck.