The chances of a mutant developing in the resulting crowd of offspring is very good. Such a mutant offspring may then metabolize an insecticide being used on a dog or cat in its immediate environment. Fleas seem to congregate where animals sleep. At this time the allergy or other immune response caused by the flea is more marked. Fleas want the animals to react.
Reactive animals are the ideal host for the flea.
Therefore, these areas are the most important when you spraying the house. In the house the odor of such a Malathion solution and the complexity of the sheltered environment call for different measures. A brochure will supplied to you with this product when purchased at a veterinary hospital. This product can be used prophylactically to keep fleas off your animals as well. Flea shampoos kill fleas present on an animal when it is bathed, but do not prevent further infestation.