@Butrflynet,
I think I read diatomaceous earth is not good for pets, thus yard animals (don't trust me). Back when I had the black widow in the kitchen, panic city, some day that will be funny, an a2ker suggested it, but said keep it away from pets. (Might have been JJorge, or not). I still have it on my to-buy list, in case, but now would be way careful with Katy around.
Ex and I used sevin for fleas back in the seventies/early eighties and I recall reading that isn't the greatest stuff either.
I used Advantage, or some name like that, back in No/California, for Pacco, but the fleas weren't overwhelming in my area.
Here, so far so good. If fleas descend that would be baaaad news, so I sympathize a lot. I've been told they don't make it here, but now I forget which people said that. Dys and the vet, I think, but I'm not positive.