Then they will cause internal bleeding. Your veterinarian can administer an antidote to prevent this problem, but it works much better if you have it done immediately and don't wait to see if your pet is going to get ill. Pesticides which are not intended for use on pets commonly cause problems. Never use a bug spray or powder not intended for use on pets. They are usually too strong for pets.
Cats are much more susceptible to insecticides than dogs.
Consequently some dog flea products are not intended for use on cats. Combining products such as a flea collar and worming medicine may lead to toxic side effects. Age is also a consideration when using flea products. Many other products around the house can be poisonous to you pet. Animals that have been poisoned may show a variety of symptoms, from extreme excitement to depression.