I just bought something called "All Seasons Horticultural Spray Oil" Saturday for my fungus gnat problem. (I was looking for Gnatrol, but no one in town had it.)
The label says that it also kills mites, thrips and spider mites, among other things. It is listed organic and the active ingredient is apparently petroleum oil. It is meant to be sprayed all over the plant and surrounding area and kills by smothering.
Honestly, I can't recommend it yet, since I have only sprayed once, but it might be something to think about it you are concerned about pets.
I'll report back when I know more.
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