You might want to consider reading this before you use flea and tick products, perhaps unnecessarily depending where your dog ventures. It appears that most of the ingredients found in these products either cause cancer, organ and/or nervous system damage
http://www.apnm.org/publications/resources/fleachemfin.pdf cut and paste this into your web browser.
a safer alternative than your monthly frontline treatment:
http://www.ghorganics.com/DiatomaceousEarth.html