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Poison on Pets II: Toxic Chemicals in Flea and Tick Collars
This April 2009 report concludes "that high levels of pesticide residue can remain on a dog's or cat's fur for weeks after a flea collar is put on an animal. Residue levels produced by some flea collars are so high that they pose a risk of cancer and damage to the neurological system of children." Includes the full report and links to related content. From the National Resources Defense Council (NRDC).
http://www.nrdc.org/health/poisonsonpets/

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