Complaint Review: Merial limited

 I purchased nexgard from my vet. I'm very very unhappy with the product It does not work. I called the company. They told me it takes 3 months for the product to work. If it isn't effective than they will do a refund. I'm not waiting 3 months for something that's supposed to work in 4 to 8 hours. My dog is suffering because I wasted money on their products. Instead of getting a product that works. Now I have to spend more money on something else so my dog isn't suffering.