I support this petition. Not only did Sentry Pro cause problems for my dog (open sore where it was applied to my dog, vomiting, etc) the product did not work on him or any of my other animals (another dog and 5 cats). Although I am aware that with any product, there are possible side effects, this is assenine. I never had this problem with Frontline. Sentry Pro is darn lucky my dog didn\'t die from this.