This company only cares about making sales and they DO NOT BACK UP THE PRODUCTS THEY SELL!! I would recommend shopping elsewhere. I purchased breveto for my boxer dog, the same flea medicine I have used the entire 8 years she's been alive and never had an issue. This is the 1st time I've bought it from this company and it was worthless. I don't know if it was even a product or if it was a placebo, that's how badly it performed. After hours of trying to reach this company I finally do and I'm told tough luck. They tell me contact Merck because they won't honor their product. I can't imagine a company this size being more concerned with the 50 bucks they made off of me then about a customer's satisfaction! I have used many other pharmaceutical companies for many products over thre 30 years ive been a pet owner and they always backup their products. I am now out the purchase price of the medication and I'm going to have to invest in Star and who knows what else to clear the flees out of the house. I have never in all the years I've owned a pet had something like this happened. I will not be ordering from this company again and I recommend you look elsewhere as well User's recommendation: Absolutely not!!