selahangel says
Both in the yard and on your dog or cat - DE
Diamatatious Earth. You can find it at the Garden center or home improvement store. Just make sure you don't get the marine grade stuff, that is for pools, you have to get the garden grade. Spread it over your yard and dust your pets with it. It will not hurt them if they eat it, you can actually put some in their food and it helps with digestion. You have to reapply when it rains or animals get wet but it will take care of these things:
fleas
snakes
ants
crickets
and any other pest with an exoskeleten.
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