Hartz UltraGuard Rid Flea and Tick Shampoo for Dogs: available at Amazon This shampoo is worth considering if your dog has irritated skin from fleas. The skin-soothing formula contains oatmeal ...

The products we investigated are flea and tick shampoos and drops sold by major companies like Sergeant's, Bio Spot, and Hartz. They all contain the same type of pesticide, called pyrethrins or ...