Diatomaceous Earth?

I did a net search and it does appear that food grade diatomaceous earth does, indeed, kill ticks and is not harmful to animals. Found instructions on how to use it as well. We'll be heading to the local Tractor Supply Co to get some in the hopes we can rid the yard of ticks or at least cut down their numbers.

From what I have read It is not a flea repellant. Diatomaceous earth can be used to kill fleas. The problem is once it gets moist then it is less effective. So if you sprinkle food grade diatomaceous earth on a cat and the cat cleans himself the earth is less effective. Diatomaceous earth is added in the package of some grains to kill bugs that may eat the grain.

If you sprinkle food grade diatomaceous earth on an animal it should not hurt him and it will kill the fleas on him

Lots of google hits on that.