Dog - Parasites - worms 狗 - 寄生虫

West Highland White Terrier
AddThis Sharing Buttons
By Nicole Pajer


Worms are one of the most common health problems for dogs. There are five types of worms that generally affect dogs: heartworms, roundworms, hookworms, tapeworms, and whipworms. Certain types of worms are easier to spot than others. For example, if your dog picks up a tapeworm, it’s common to see what resembles grains of rice in its stool. Heartworms, on the other hand, are harder to diagnose and an infected dog will often show only subtle symptoms until the disease has progressed to a more advanced stage.

Here are the 11 most common symptoms of worms in dogs:

1. Coughing

One of the advanced stage symptoms of heartworms in a dog is coughing. Dogs with hookworms and roundworms may also develop a cough.

2. Vomiting

Dogs that have worms will often throw up. Roundworms can sometimes show up in a dog’s vomit.

3. Diarrhea

Soft stools and canine diarrhea can be the result of worms. In addition to diarrhea, dogs with hookworms may have blood in their stools.

4. Low energy

Dogs that are lethargic and less active than normal may be showing symptoms of having worms.

5. Pot bellied appearance

If your dog starts to appear pot bellied or bloated, it may have contracted worms. This is commonly seen in puppies that have picked up worms from their mother.

6. Change in appetite

If you notice a sudden change in your dog’s appetite, he may have come into contact with roundworms. Dogs that are infected often lose their appetite. As worms steal a dog’s nutrients, a dog with worms may also show a sudden increase in hunger.

7. Weight loss

If your dog shows signs of rapid weight loss, he may have a tapeworm or a whipworm.

8. Dull coat

A healthy dog should have a shiny thick coat. If your dog’s coat begins to dull and dry out, he may have picked up a form of worms. Loss of hair or the appearance of rashes can also denote worms.

9. Itching and signs of skin irritations

Dogs that show signs of skin irritation may have a severe infestation of worms.

10. Rubbing its bottom on the ground or “scooting”

While this can often be caused by problems with the anal glands, dogs with worms will occasionally rub their rear ends on the floor in order to relieve themselves of the itch due to worms in the area.

11. Visible worms in fur or fecal matter

Some worms, such as tapeworms may appear as small moving segments in the fur or area around dog’s anus. Roundworms can often be seen in a dog’s stools.

If you suspect worms in your dog

If left untreated, worms can damage your dog’s internal organs and lead to loss of consciousness and death. If you suspect that your dog has worms, take it to your nearest veterinary office. Most intestinal worms are easy to treat and your veterinarian will prescribe a medication based on the diagnosis. Heartworm disease, however, can be expensive and difficult for your dog, so the best treatment is administration of a monthly preventive medication (which can also prevent other worm infections). Consult with your vet for recommendations for your dog.


Was your dog ever diagnosed with heartworms? How did you treat it? Tell us in the comments.


How Do Dogs Get Worms?

How a dog gets infected by worms depends on the kind of worms the dog has. There are a lot of different kinds of worms that live in dogs. All of these kinds of worms are called parasites because they feed off the dog instead of living on their own. These are not worms like earthworms; parasite worms have to get inside a dog to reproduce.

The most common ones in dogs are roundworms, hookworms, whipworms, tapeworms, and heartworms. Roundworms and hookworms are found a lot in puppies and sometimes in adult dogs. Whipworms, tapeworms, and heartworms are seen more in older dogs.

Show Me the Worms!

What are roundworms?

Roundworm face


"Roundworms" describes a whole bunch of different worm parasites. The most common dog roundworm is Toxocara canis. Humans have a different roundworm, as do cats, horses, pigs, and other animals.

Dogs get roundworms either from eating worm eggs off the ground or because the mother dog was infected and passed the worms to her puppies during her pregnancy.

Adult roundworms have a funny face, with three big lips surrounding their mouth. They feed on partially digested food in the dogs intestine.

What are hookworms?

Hookworm mouth profile


Hookworms are smaller than roundworms. They are called hookworms because they feed by hooking onto the wall of the intestine.

Hookworms have pretty sharp teeth and cause the dog's intestine to bleed. Since hookworms eat blood, they like this situation, but too many of them can be very bad for the dog.

Dogs can get hookworms from the ground where other dogs have passed eggs before, or from the milk of their mother if she was infected.

What are whipworms?



Whipworms also make the dog's intestine bleed because they bury their long necks into the intestine wall when they feed.

They are called whipworms because their long neck next to their short fat body looks like a whip and a whip handle.

Dogs usually get whipworms from eating eggs that other dogs have shed.

What are tapeworms?



Tapeworms also live in the dog's intestine. They are called tapeworms because of their long, flat, ribbon tape appearance.

Dogs usually get tapeworms when they eat a flea that ate a tapeworm egg. There is another kind of tapeworm that dogs can get when they eat a rabbit that ate a tapeworm egg.

Tapeworms don't have mouths. They feed by absorbing food across their skin. But they hold onto the wall of the intestine with hooks and suckers on their head.

What are heartworms?



Heartworms are parasites that live in the blood vessels and heart of dogs. Sometimes cats are infected with heartworms too.

Because heartworms live inside the heart, too many of them can cause the dog's heart not to work very well and the dog can get sick. In small dogs and cats even a few worms can cause a big problem.

Dogs get heartworms when an infected mosquito bites them. The mosquito got infected by biting another dog that already had heartworms.

How Do I Find Out if My Dog Has Worms?

Your veterinarian can tell you if your dog has worms. The doctor will check a fecal sample from your dog to see if it has any intestinal worms and a blood sample to see if it has any heartworms.

Most veterinarians recommend checking once a year to make sure your dog is free of worms. If your dog does have worms, the doctor can give your dog medicine to get rid of them.

Can I Get Worms From My Dog?

Most parasitic worms are very species-specific. This means that worms from dogs don't get into people, and worms from people don't get into dogs. Very rarely some dog worms will try to infect people and can make them sick, but the worms come from places where lots of dog eggs have been shed, like parks and playgrounds, and not necessarily from a single pet.

Regular vet visits are the best prevention.

The best way to prevent anyone from getting infected with any worms is to make sure your dog sees your veterinarian regularly: as soon as you get a new puppy and once a year with an adult dog.

In the United States, the most common worm in children is the pinworm. Dogs and cats don't get pinworms and can't give pinworms to children.


Last Updated April 10, 2007

The content and opinions expressed on this Web page do not reflect the views of nor are they endorsed by the administration of the University of Georgia or the University System of Georgia.

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video

YouTube Video