Wonderful product. Would not be without it. A word of caution - if your dog is on the low side of the weight range you might consider using the next smaller dose. Our Shi Tzu is 13 pounds and the 10 to 20 pound range product was too strong and occasionally would upset his stomach. We use the up to 10 pound dose year round with no stomach upset and get great results - fleas don’t hang around and if a tick does bite him it dies. We live in a very rural area so there are quite a few wild animals around and they do spread fleas and ticks.