Tênias em cães e gatos: sinais, tratamento e prevenção

How pets get tapeworms

Adult tapeworms live in the small intestine. They attach to the gut wall and grow as a long chain of small segments. The segments at the end of the chain fill with eggs, break off, and leave the body in the stool or crawl out through the anus.

Flea larvae living in the pet's bed, the carpet, or the yard eat these eggs. The young tapeworm then develops inside the flea as the flea grows into an adult. When a dog or cat grooms itself or chews at an itchy spot, it can swallow an infected flea. New segments can start to appear in as little as two to three weeks. Chewing lice can carry the tapeworm in the same way, though fleas are the more common source.

So the only way a pet catches the flea tapeworm is by swallowing an infected flea or louse. Sniffing another animal's stool or touching the segments will not pass it on.

Other tapeworms follow a different route. Taenia tapeworms come from eating rodents, rabbits, or other prey, or raw meat and organs from farm or wild animals. Echinococcus tapeworms reach dogs mainly through raw organs of infected livestock or through prey such as rodents. These types are less likely in pets that live indoors and eat commercial food, and more likely in dogs and cats that hunt or scavenge.

What owners notice

Many pets with tapeworms look and act normal. The first sign is usually the segments themselves.

• Fresh segments are white or cream, flat, and about half an inch (12 mm) long. They look like grains of rice or cucumber seeds and can move or stretch.
• Dried segments shrink into hard, yellowish or golden specks about 2 mm long.
• You may find them on the surface of fresh stool, stuck to the fur around the anus, or where your pet sleeps.
• Some pets lick under the tail or scoot their rear along the floor because the segments irritate the skin. Scooting is much more common in dogs than in cats.
• Now and then a pet vomits a longer piece of worm.

Most adult pets have no other signs. A heavy infection, especially in a puppy or kitten, can cause poor growth, a dull coat, weight loss, or an upset stomach. Seeing fleas, or flea dirt that looks like black pepper in the coat, is another strong clue.

When to see the vet soon

Tapeworms on their own are rarely an emergency. It is best to call your vet the same day if a puppy or kitten seems weak, stops eating, or has pale gums. Young animals with many fleas can lose enough blood to become anemic, and in rare cases a very heavy worm load can block the intestine.

Prompt care is also recommended for repeated vomiting, a swollen or painful belly, straining without passing stool, or bloody diarrhea. A pet that keeps scooting may have full or infected anal glands instead of, or as well as, worms. Swelling or a wound near the anus should be checked soon.

If the worms you see look like thin strands of spaghetti instead of flat segments, they are more likely roundworms. These are treated differently, so it helps to tell your vet exactly what you saw.

How vets diagnose it

In most cases the diagnosis starts with what you saw at home. Routine stool tests often miss this tapeworm, because the eggs stay packed inside the segments and are not spread evenly through the stool. A negative stool test does not rule it out.

To help your vet, you can collect a few segments or a fresh stool sample in a sealed bag or small container and bring it to the appointment. Use a glove or a bag over your hand, and wash your hands afterward. The vet can look at the segments under a microscope to confirm the type of worm. They will usually also check the coat for fleas and ask about hunting, scavenging, and diet, since these point to which tapeworm is most likely.

How it is treated

Tapeworms are treated with a prescription dewormer that works against them. Not every dewormer does, so a general wormer that clears other worms may leave tapeworms behind. Depending on the pet, your vet may give tablets, a spot-on product, or an injection. These medicines are generally safe and work well. The worms are usually digested in the gut afterward, so you may not see them pass.

The flea problem needs attention at the same time. If fleas remain on the pet or in the home, a pet can pick up tapeworms again in as little as two weeks. Vets usually recommend flea treatment for every dog and cat in the household, along with cleaning of the home.

Now and then, segments keep appearing even with good flea control. Cases that do not respond to the usual medicines have been reported, though they are uncommon. If you still see segments a few weeks after treatment, tell your vet. They may repeat the treatment, choose a different medicine, or look again at how fleas are getting in.

How to prevent tapeworms

Prevention is mostly flea control. It matters for indoor pets too, since fleas can come in on other animals or on people.

• Use a flea product your vet recommends on every dog and cat in the home. Many vets advise using it all year.
• Vacuum floors and furniture often and wash pet bedding in hot water, because flea eggs and larvae live there.
• Check the coat for fleas or flea dirt, especially after boarding, travel, or contact with other animals.
• Limit hunting and scavenging where you can, and avoid feeding raw organs or raw meat from farm or wild animals.
• Pick up dog stool promptly in the yard and on walks.
• Ask your vet how often your pet should be dewormed. The right schedule depends on age, lifestyle, diet, and where you live.

Risk to other pets and people

Other pets in the home can get tapeworms from the same fleas. They cannot catch the flea tapeworm straight from an infected pet. This is why vets usually treat fleas on all the animals together.

People rarely get the flea tapeworm. It happens only when someone swallows an infected flea, and most reported cases are in children. Many infected people have no symptoms, and the infection is readily treated. A parent may notice small rice-like segments in a child's diaper or stool. If that happens, talk to your family doctor. Touching the segments does not infect a person, though washing your hands after handling them is still sensible.

Echinococcus is different. Its eggs pass in the stool of infected dogs and some wild animals, and people who swallow them can develop cysts or growths in organs, most often the liver or lungs. This is a serious disease, which is one reason health authorities recommend regular deworming for dogs that may eat raw organs of livestock or wild animals. Washing hands after handling pets, cleaning litter boxes, or picking up stool, and teaching children to do the same, lowers the risk from all of these parasites.

Tapeworms in rescued and newly adopted pets

Dogs and cats rescued from the street or from crowded places often arrive with fleas, and tapeworms can come with them. Animals that had to find their own food may also have eaten prey, carcasses, or scraps, which raises the chance of other tapeworm types.

At Paw Squadron, the first stops after every rescue are the vet and a bath. Each animal gets a checkup, deworming, and treatment against fleas and other parasites. Before adoption, every animal also has vaccinations and a microchip.

A visit with your own vet soon after your new pet arrives is still a good idea. Bring the health records you received, keep flea protection going without a gap, and ask which deworming schedule suits your pet's new life. If you see rice-like segments in the first weeks, it is a common and treatable finding. Collect a few, call your vet, and treat the home for fleas as well as the pet.

You can find more guides on parasites and new-pet care in PawPedia, or meet the animals waiting for a family on our Adoptions page.