Information about Intestinal Worms & Heartworm..
The most common internal parasite problems in companion animals are intestinal worms (roundworm, tapeworm, hookworm and whipworm) and heartworm.
Many dogs and cats can have a mild parasite infestation and show no symptoms. A healthy animal may fight off an infestation without their guardian ever knowing about it. Dogs and cats with stressed or weakened immune systems, however, will succumb to a more severe infestation if left unchecked.
It seems that new pets often arrive with worms. Most puppies and kittens will have intestinal worms from birth. The worms are passed on from the mother, and the undeveloped immune systems and gastrointestinal systems of very young animals cannot keep the parasite population in check. Rescued animals should also be checked for parasite infestations as stress and crowded conditions contribute to the animal's vulnerability to parasites.
The information is not intended to be a substitute for visits to your local veterinarian.