Depending where you live, some people have major flea and tick infestations and it can lead to family pets becoming a host to both. Fleas are especially hard to get rid of once they are in the home. The pets who have fleas are dropping flea eggs everywhere they go, and they end up hanging out until they hatch. They can get stuck in furniture, cracks in the floor, carpets and just about anywhere else and then they hatch and end up on pets again. The best thing is to avoid having them become infested in the first place. There are a lot of products out there and I've found most of them don't work. Frontline is a tried and true brand for flea and tick control although it can get costly when buying for numerous pets. When buying topical frontline the type of animal and weight matters and with this spray it does not. You can use the same bottle on all of the animals you have. It is simple to use, just wear gloves and spray the pet while rubbing the sprayed hair to work it in. I like that it's not a tiny tube and I like that I don't have to buy 4 different boxes for all my pets. It is cheaper to do it this way and to apply it to the entire body then it is for the small tubes that apply only to the back of the neck area. It works good but I find with our dogs who swim frequently it doesn't last the full 30 days. But it comes close. It keeps the fleas and ticks off and I live in an area that has major fleas and ticks and animals become infested quickly as soon as the weather warms up. Flea sprays can cause irritation to sensitive pets so I recommend using it first on a small area of their skin to be sure they won't have an allergy to the ingredients. My pets did not have any reaction but it's good to know before covering most of their body. I think this is a good product and its a cheaper alternative to a lot of the flea and tick products on the market. I've tried several and frontline works much better and for much longer. It's nice to have a product that works so well.