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Whipworms
What are Whipworms?
Whipworms are intestinal parasites which are about 1/4 inch (6 mm) long. They live in the cecum and colon of dogs where they cause severe irritation to the lining of those organs. This results in watery, bloody diarrhea, weight loss, and general debilitation. They are one of the most pathogenic worms found in dogs.
How did my dog get whipworms?
Whipworms pass microscopic eggs in the stool. The eggs are very resistant to drying and heat, so they can remain viable in the dog's environment for years. They mature and are able to reinfect the dog in 10-60 days. The eggs are swallowed and return to the lower intestinal tract to complete the life cycle.
How is whipworm infection diagnosed?
Whipworms are diagnosed by finding eggs with a microscopic examination of the stool. However, multiple samples are often required because these parasites pass small numbers of eggs on an irregular basis. Any dog with chronic diarrhea can be reasonably suspected to have whipworms, regardless of several negative stool examinations. It is an accepted practice to treat for whipworms based on assumption of infection. Response to treatment is an indication that whipworms were present but could not be detected on fecal examination.
How are whipworms treated?
There are several drugs that are very effective against whipworms. Two treatments are needed at a 3-4 week interval. Because reinfection is such a problem, it is advisable to treat again every 3-4 months or to put the dog on a heartworm prevention product. These products contains an ingredient that prevents infection with whipworms. Whipworms are not nearly as common now because of widespread use of heartworm prevention products.
Can I get whipworms from my dog?
No. Whipworms are not infectious to people; they are parasites of the dog.
Tapeworm
What kind of problems do tapeworms cause for the dog?
Tapeworms are not highly pathogenic (harmful) to your dog. They may cause debilitation and weight loss when they occur in large numbers. Sometimes, the dog will scoot or drag its anus across the ground or carpet because the segments are irritating to the skin in this area. The adult worm is generally not seen, but the white segments which break away from the tapeworm and pass outside the body rarely fail to get an owner's attention!
Occasionally, a tapeworm will release its attachment in the intestines and move into the stomach. This irritates the stomach, causing the dog to vomit the worm. When this happens, a worm several inches in length will be seen.
How is tapeworm infection diagnosed?
An infection with Dipylidium is usually diagnosed when the white, mobile segments are seen crawling on your dog or in the stool. Tapeworms are not usually detected by the routine fecal examination performed by the veterinarian. Because of this, veterinarians depend on the owner to notify them of possible tapeworm infection in the dog.
Echinococcus infections are harder to diagnose than the tapeworm caused by fleas because the segments are small and not readily seen.
How are the tapeworms treated?
Treatment is simple and, fortunately, very effective. A drug which kills tapeworms is given, either orally or by injection. It causes the tapeworm to dissolve within the intestines. Since the worm is usually digested before it passes, it is not visible in your dog's stool. These drugs should not cause vomiting, diarrhea, or any other adverse side-effects.
Control of fleas is very important in the management and prevention of tapeworm infection. Flea control involves treatment of your dog, the indoor environment and the outdoor environment where the dog resides. If the dog lives in a flea-infested environment, reinfection with tapeworms may occur in as little as two weeks. Because the medication which treats tapeworm infection is so effective, return of the tapeworms is almost always due to reinfection from the environment.
How do I tell tapeworms from pinworms?
Tapeworms and pinworms look very similar. However, contrary to popular belief, pinworms do not infect dogs or cats. Any worm segments seen associated with dogs are due to tapeworms. Children who get pinworms do not get them from dogs or cats.
Echinococcus tapeworms are of more concern. These tapeworms cause very serious disease when humans become infected. Hunters and trappers in the north central United States and south central Canada may be at risk for infection by this worm if strict hygiene is not observed. Rodent control and good hygiene are important in preventing the spread of this disease to humans. As with the more common tapeworm, infection with Echinococcus is infrequent but possible.
What can be done to control tapeworm infection in dogs and to prevent human infection?
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Effective flea control is important.
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Prompt deworming should be given when parasites are detected; periodic deworming may be appropriate for pets at high risk for reinfection.
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All pet feces should be disposed of promptly, especially in yards, playgrounds, and public parks.
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Strict hygiene is important, especially for children.
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Do not allow children to play in potentially contaminated environments.
Heartworm
What causes heartworm disease?
Heartworm disease (dirofilariasis) is a serious and potentially fatal disease in dogs. It is caused by a worm called Dirofilaria immitis.
Heartworms are found in the heart and large adjacent vessels of infected dogs. The female worm is 6 to 14 inches (2.3 to 5.5 cm) long and 1/8 inch (5 mm) wide; the male is about half the size of the female. One dog may have as many as 300 worms.
How do heartworms get into the heart?
Adult heartworms live in the heart and pulmonary arteries of infected dogs. They have been found in other areas of the body, but this is unusual. They survive up to 5 years and, during this time, the female produces millions of young (microfilaria). These microfilaria live in the bloodstream, mainly in the small blood vessels. The immature heartworms cannot complete the entire life cycle in the dog; the mosquito is required for some stages of the heartworm life cycle. The microfilaria are therefore not infective (cannot grow to adulthood) in the dog, although they do cause problems.
As many as 30 species of mosquitoes can transmit heartworms. The female mosquito bites the infected dog and ingests the microfilariae during a blood meal. The microfilariae develop further for 10 to 30 days in the mosquito and then enter the mouth parts of the mosquito. The microfilariae are now called infective larvae because at this stage of development, they will grow to adulthood when they enter a dog. The mosquito bites the dog where the haircoat is thinnest. However, having long hair does not prevent a dog from getting heartworms.
When fully developed, the infective larvae enter the bloodstream and move to the heart and adjacent vessels, where they grow to maturity in 2 to 3 months and start reproducing, thereby completing the full life cycle.
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