Cats are more sensitive to organophosphate insecticides than most other animals. Currently, there are few flea products in the United States labeled for use on cats that contain organophosphates as an active ingredient. The few that can be used on cats contain a small concentration of organophosphate. However, many household sprays and products that are specifically labeled "for use on dogs only" are widely available. Again, avoid these dog products!

In some cases, exposed cats can start showing signs within hours. Symptoms would include drooling, depression, labored breathing, weakness, and convulsions. Without prompt and proper treatment, many exposures could lead to the animal's death. With appropriate treatment by a veterinarian, the survival chances are much higher.