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Are Worms Harmful to Cats? You Must Know

Ella by Ella
24/03/2025
in cat health
cat

Cats are beloved companions in many households, and their well-being is a top priority for pet owners. One of the common health concerns for felines is worm infestations. Parasitic worms can affect a cat‘s health in various ways, ranging from mild discomfort to severe complications. Understanding how worms impact cat health, recognizing symptoms, and knowing the best treatment and prevention strategies are essential for responsible pet care.

What Types of Worms Can Affect Cats?

There are several types of worms that commonly affect cats. Each type of worm poses unique risks to a cat’s health.

1. Roundworms (Toxocara cati, Toxascaris leonina)

Roundworms are among the most common intestinal parasites in cats. These worms are long, white, and resemble spaghetti. Kittens are particularly vulnerable to roundworm infestations, often acquiring them from their mother’s milk or contaminated environments.

How They Affect Cat Health:

Interfere with nutrient absorption, leading to malnutrition and stunted growth in kittens.

Cause vomiting, diarrhea, and a potbellied appearance.

Severe infestations may lead to intestinal blockage.

2. Tapeworms (Dipylidium caninum, Taenia spp.)

Tapeworms are segmented worms that attach themselves to the intestines of cats. These worms are often transmitted through fleas or by consuming infected rodents.

How They Affect Cat Health:

Lead to weight loss despite a good appetite.

Cause irritation around the anus, leading to excessive licking or scooting.

Visible worm segments resembling grains of rice in the cat’s feces or bedding.

3. Hookworms (Ancylostoma tubaeforme, Uncinaria stenocephala)

Hookworms are small, thread-like parasites that latch onto the cat’s intestinal walls and feed on blood. These worms are particularly dangerous to kittens and immunocompromised cats.

How They Affect Cat Health:

Cause anemia due to blood loss, leading to weakness and pale gums.

Lead to bloody diarrhea and weight loss.

Can be transmitted to humans through skin contact.

4. Heartworms (Dirofilaria immitis)

Unlike intestinal worms, heartworms primarily affect a cat’s heart and lungs. These worms are transmitted through mosquito bites.

How They Affect Cat Health:

Cause respiratory distress, coughing, and lethargy.

Lead to heartworm-associated respiratory disease (HARD), which can be fatal.

Unlike in dogs, there is no approved treatment for heartworm disease in cats, making prevention crucial.

5. Lungworms (Aelurostrongylus abstrusus)

Lungworms infect a cat’s respiratory system and are acquired through the ingestion of infected snails, slugs, or rodents.

How They Affect Cat Health:

Cause coughing, wheezing, and difficulty breathing.

May lead to pneumonia in severe cases.

Symptoms can be mistaken for asthma, delaying proper diagnosis.

How Do Cats Get Worms?

Cats can acquire worms in several ways, and understanding the transmission methods can help in prevention.

1. Ingesting Contaminated Food or Water

Eating raw or undercooked meat, drinking contaminated water, or consuming infected prey like mice and birds can introduce worms into a cat’s system.

2. Mother-to-Kitten Transmission

Kittens can get roundworms from their mother’s milk if she is infected. This makes regular deworming essential for pregnant and nursing cats.

3. Fleas and Other Parasites

Tapeworms are commonly transmitted when cats swallow fleas carrying tapeworm larvae while grooming themselves.

4. Contact with Contaminated Environments

Cats can pick up worm eggs from contaminated soil, grass, litter boxes, or shared spaces with infected animals.

5. Mosquito Bites

Heartworms are transmitted through mosquito bites, putting even indoor cats at risk.

Signs and Symptoms of Worm Infestations in Cats

Worm infestations can manifest in various ways, depending on the type and severity of the infection. Some common signs include:

Weight loss despite normal or increased appetite.

Potbellied appearance, especially in kittens.

Vomiting and diarrhea, sometimes containing worms.

Lethargy and weakness due to anemia or nutritional deficiencies.

Coughing and difficulty breathing (in cases of lungworms or heartworms).

Dull coat and poor overall appearance.

Visible worms or worm segments in feces, vomit, or around the anus.

Complications of Untreated Worm Infestations

If left untreated, worms can cause serious health problems in cats.

1. Malnutrition and Weakness

Worms compete for nutrients, leading to malnourishment, slow growth, and weakened immune function.

2. Intestinal Blockages

Severe roundworm infestations can cause life-threatening intestinal obstructions, requiring emergency veterinary intervention.

3. Anemia and Blood Loss

Hookworms, in particular, feed on a cat’s blood, leading to severe anemia, especially in young kittens.

4. Respiratory Issues

Heartworms and lungworms can severely damage a cat’s lungs, leading to chronic breathing problems or even sudden death.

5. Transmission to Humans

Some cat worms, such as roundworms and hookworms, can be transmitted to humans, posing a risk to families with young children or immunocompromised individuals.

Diagnosis and Treatment of Worms in Cats

1. Veterinary Diagnosis

If you suspect your cat has worms, a veterinarian will typically perform a fecal examination to detect worm eggs. Blood tests, X-rays, or ultrasounds may be needed for diagnosing heartworms and lungworms.

2. Deworming Medications

Veterinarians prescribe dewormers based on the type of parasite. These medications come in oral, topical, or injectable forms.

Common deworming medications include:

Pyrantel pamoate (for roundworms and hookworms).

Praziquantel (for tapeworms).

Milbemycin oxime, Ivermectin, or Selamectin (for heartworms and multiple parasites).

3. Supportive Care

Severely infested cats may require additional treatment such as:

Fluid therapy for dehydration.

Nutritional support for malnourished cats.

Oxygen therapy in cases of respiratory distress.

Preventing Worm Infestations in Cats

1. Routine Deworming

Regular deworming, especially for kittens, is crucial. Many veterinarians recommend deworming every 3-6 months for adult cats.

2. Flea Control

Since fleas transmit tapeworms, using flea prevention treatments can reduce the risk.

3. Proper Hygiene and Cleanliness

Regularly clean litter boxes and wash bedding.

Prevent cats from eating prey or scavenging.

Provide fresh, clean water and avoid raw meat diets.

4. Indoor Living and Supervised Outdoor Access

Keeping cats indoors or providing supervised outdoor time in enclosed spaces can minimize exposure to contaminated environments.

5. Mosquito Protection

Using mosquito repellents safe for cats or keeping them indoors during peak mosquito activity can help prevent heartworm infections.

Conclusion

Worm infestations are a significant concern for cat health, affecting their well-being in various ways. While some worms cause mild discomfort, others can lead to severe complications or even death if left untreated. Regular deworming, parasite prevention, and veterinary check-ups are crucial in keeping cats healthy and free from worms. By understanding the risks and taking proactive measures, cat owners can ensure their feline companions live long, happy, and parasite-free lives.

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Ella

Ella

Ella has been practicing veterinary medicine since 2007. Her veterinary experience ranges from routine health care and preventive medicine to emergency and specialty care, where she performs duties ranging from specialty care to clinical management. Not only is Ella a veterinarian, she writes about pets and donates her free time to local animal shelters. She started writing in 2020, and since then Ella has covered feline behavior and health, current events, first-hand product reviews, and a variety of cat-related content.

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