How Do Dogs and Cats Get Worms?

Puppies and kittens are born with intestinal worms. This occurs because worms resting within the mother's body are stimulated to grow by hormones secreted during pregnancy. The newly developed worms within the mother pass through the placenta (transplacental) and into the young before they are born. In addition, worms are passed through the mother's milk (transmammary) to the young. Puppies, kittens, and female dogs that are nursing should be wormed routinely.

Adult dog and cats pick up worms from eggs that stay in the soil after pets have defecated. Some worm eggs survive for years in soil. Pets also pick up worms from:

• Eating fleas
• Catching prey, such as mice and snails
• Eating feces of other pets and farm animals

Types of worms in dogs and cats

Worms are internal parasites that drain pets of blood and nutrients. Dogs and cats get worms that can be classified by shape into round or flat. Three types of round-shaped worms (nematodes) live in pet intestines: roundworms, hookworms, and whipworms. Two types of flat-shaped tapeworms (cestodes) live in pet intestines and other organs, including the liver: echinococcus and taenia. Dogs commonly get hookworms, whipworms, roundworms, and tapeworms. Cats commonly get roundworms, hookworms, and tapeworms, but not whipworms.

Pets can also get lungworms, esophageal worms, bloodworms, kidney worms, liver flukes, and intestinal protozoa. The most common pet worms are roundworms, and hookworms. Heartworms (Dirofilaria immitis) are not intestinal parasites but are parasites that live in the heart. Heartworms are not spread like regular intestinal worms, but are spread by mosquitoes. They infect both cats and d ogs and can cause death.

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