Seeing is believing
I have used these two products since 2014, when we moved to Florida after I retired. We have two Jack Russel dogs which are white. I let one of the dogs out the back door one afternoon, and saw about 20 fleas jump on her. She has been on Nexgard since she was a pup, and as soon as they hit her back, they jumped right back off. My dogs have NEVER had a flea on them. Seeing is believing! They have not had any signs of Heartworms either, thanks to Heartgard. These products absolutely do work.