Often time we don't see fleas in the house, we assume that our pets are not carriers, but we can be wrong.
A common misconception about fleas is that when the weather starts to get cold, they all die. In reality, what they are doing is trying to do what every other creature on this earth tries to do; get warm. - Faith Eversole
Fleas can hop on your pets even after you take your cats or dogs out of the groomer's. The reason that cats don't get fleas as often as dogs is because of their self-grooming habit. However, if you see their change of behavior such as excessive grooming or licking their belly until their hair comes out, that could be an indication of fleas.
How to Fix Flea Problem in Your home provides some quick fix and long term solutions for you to get rid of your flea problem.
When using the topical medications, keep in mind that every dog and cat that lives in the household must be treated. Fleas will go from one pet to another leaving the product less than effective if everyone isn't treated.
I feel I must also tell that there are times when the case is more than severe. In these cases, professional help will need to be sought and you just might need to have an exterminator get rid of these nasty critters. - Faith Eversole