Thanks Brenda. I am always on the safe side about using new products, and I am glad to find out this can cause a problem in some dogs before trying it. I am so fortunate not having a flea or tick problem in our yard. However I have used Frontline Plus before going to a show site where these pests might be a problem. bonnie http://www.fancitoypoodles.com<http://www.fancitoypoodles.com/> Est. 1986 AKC Breeder Of Merit http://www.petakillsanimals.com<http://www.petakillsanimals.com/> Showing dogs is like gambling, if you cannot afford to lose, don't go.