The popular chemical-based flea and tick control products are attracting increasing attention because of widespread side effects being reported by dog owners who have used the products. The EPA has initiated an investigation of chemical spot-on flea and tick products due to the high number of reported adverse reactions.
Here's a quote from the report summary: "Adverse reactions reported from the spot-on products range from mild effects such as skin irritation to more serious effects such as seizures and in some cases death." Read the entire report summary here.
The Natural Resource Defense Council has filed suit in California to block the sale of chemical-based flea and tick collars due to concerns over exposure of pets and children to toxic chemicals.
If you use these products keep a sharp eye out for any changes or reactions in your B.