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Found this at tractor supply the other day if anyone else is looking for something for fleas.http://m.tractorsupply.com/en/store/compare-n-save-systemic-tree--shrub-insect-drench-1-gal
Other ingredients are propelyne glycol and other ingredients not specified are consider non hazardous. This is what I found on the safety data sheet for this product.
I use the bayer advantage complete insect killer in my pens and i like it. Don't have any fly or fleas. Also kills soil insects up to 3 months. Good product to use .