What are External Parasites in Dogs?

What are External Parasites in Dogs?

What is it?

External parasites in dogs are any organisms that live on or within the skin or fur of the dog and feed on blood or other bodily fluids. These parasites can cause a range of skin and health problems for dogs, including itching, irritation, and disease transmission. External parasites can include fleas, ticks, mites, lice, and mosquitoes.

How is it Treated?

The treatment of external parasites in dogs depends on the type and severity of the infestation. In many cases, topical or oral medication may be recommended to kill and prevent further infestations. In cases where the infestation is severe or has led to other health problems, additional treatments such as antibiotics or supportive care may also be necessary.

Breed Predispositions

There is no specific breed predisposition to external parasites in dogs. However, factors such as lifestyle, exposure to outdoor environments, and poor hygiene can increase the risk of external parasite infestations.


Amanda had always enjoyed the bond she shared with her lively Australian Shepherd, Luna, frequently taking her on outdoor adventures through the woods and along the beach. One day, as they returned from a particularly exciting hike, Amanda noticed Luna incessantly scratching and biting her fur. Concerned, she decided to give her a thorough inspection and was shocked to discover small, unwelcome guests hiding among Luna’s beautiful coat: external parasites. In this blog post, we will delve into the world of external parasites in dogs, discussing the various types, symptoms, treatments, and preventative measures. As you read on, you’ll gain the knowledge necessary to protect your canine companion from these pesky invaders, ensuring they can continue to enjoy their outdoor escapades while remaining happy and healthy.

Parasites are organisms that live inside another organism without harming it. They feed on the host’s blood, tissue, or fluid. Many parasites are harmless, but some are dangerous and even fatal. Examples of external parasites in dogs include fleas, ticks, mites, lice, etc. These parasites can cause serious health issues and discomfort for your dog if they are not cared for properly.

It is essential to regularly check your pet for signs of external parasites and seek treatment if necessary by consulting with your veterinarian for diagnosis, prevention and treatment options.

Types of External Parasites in Dogs

Many external parasites exist, including fleas, ticks, mites, and lice. Fleas are tiny insects that bite dogs and spread disease. Ticks are giant arachnids that feed on blood. Mites are tiny creatures that burrow into the skin and suck out fluids. Finally, lice are wingless insects that attach to hair follicles and suck blood.


Flea infestation is one of the most common problems pet owners face today. These tiny insects feed off the blood of pets and humans. They are easily spread among animals via contact with each other, contaminated bedding, clothing, toys, etc. Fleas and ticks cause irritation, itching, scratching, hair loss, skin rash, and even secondary infections such as ringworm. In addition, dogs and cats can contract diseases like tapeworms, heartworms, mange mites, eye disorders, and kidney disease. 

Tick Infestations

Types of tick species are tiny arachnids that live on wild animals and domestic livestock. They carry bacteria that cause Lyme Disease, Rocky Mountain Spotted Fever, Ehrlichiosis, Tularemia, and Babesiosis. In addition to being vectors for infectious agents, ticks transmit bacterial pathogens that cause tick paralysis, tularemia, Colorado Tick Fever, and anaplasmosis.


Different types of lice parasitic insects attach themselves to the skin, face, body, and pubic areas. They suck blood, causing intense itching and discomfort. Their eggs are passed onto the next host during close contact. Lice are usually associated with poor hygiene and unkempt appearance.

Demodex Mites

Demodex mites are prevalent in dogs but rarely seen in humans. They live in the hair follicles of animals and feed off dead skin cells. They are found in nearly every dog. However, most cases occur between 4 months and eight years. Stressful situations like boarding kennels or being left alone without food or water can cause a dog to become ill and shed their coat. This allows the mite population to increase.

Ear Mites

Ear mite infestations are usually transmitted through close physical contact. For example, a dog rubbing against another animal or a human may pick up the parasite. If you notice that one of your pets has ear infections, it could mean they have ear mites. Regular ear cleaning can help prevent your dogs from getting ear mites.


Sarcoptes scabiei is the most common species of Sarcoptes responsible for sarcoptic mange. They are highly contagious, worm-like parasites that cause deep skin lesions. The parasite lives in the hair follicles and causes inflammation and thick scales that may push out surrounding hair. It can be spread through contact with infected animals or their excrement, although it’s more commonly contracted by scratching or rubbing affected areas. Symptoms typically develop within three weeks after exposure and can wax and wane over time, but they generally last between six to 12 months. 

Causes of External Parasites in Dogs

There are many reasons why dogs develop internal parasites. Commonalities include poor nutrition, stress, lack of exercise, overpopulation, and improper grooming. But there are some things we still need to understand.

One of those things is why certain breeds seem prone to developing external parasites that can cause extreme pain to young dogs. This often happens with German Shepherds, Golden Retrievers, Labradors, and Boxers.

We’re not saying these breeds are inherently wrong; instead, we’re simply pointing out that it spreads quickly through the entire population when they encounter a parasite infestation. And because of this, we recommend keeping your dog away from other animals until they are entirely parasite-free.

Causes of external parasites in dogs

Clinical Signs of External Dog Parasites

Dogs may be infected with worms, fleas, ticks, or tapeworms. The most common parasite found in dogs is a roundworm (Toxocara), followed by hookworms, whipworms, and heartworms.

Symptoms may vary depending on the type of parasite and where it lives. Flea bites usually cause itching and scratching. Ear mite infestations result in painful ears. Ticks transmit Lyme disease; Rocky Mountain spotted fever, anaplasmosis, babesiosis, and ehrlichiosis—hookworms cause diarrhea and malnutrition. Roundworms produce worms that grow inside the intestines. Tapeworms cause intestinal blockage. Whipworms cause severe abdominal pain. Heartworm causes congestive heart failure.

Other symptoms include vomiting, weight loss, lethargy, coughing, sneezing, and skin allergies. In addition, some dogs develop liver disease, intestinal blockage, seizures, blindness, paralysis, or kidney failure.

If you suspect your dog has an infection, immediately take him to the vet. Your veterinarian will perform a thorough examination and test for parasites. They will also recommend appropriate treatments.

Diagnosis of External Parasites in Dogs

Vets diagnose external parasites such as fleas, mites and ticks in dogs by conducting physical examinations to assess for any signs and symptoms of possible infestation. They will use a comb to check for any visible parasites on the pet’s fur or skin and look for evidence of damaged hair follicles, redness or irritation on the skin that could suggest an infestation.

Vets may also take samples of the pet’s fur or skin scrapings to examine under a microscope for visible eggs, larvae, and adult parasites. They may also use an ELISA test – a measuring technique that detects clues suggesting parasite presence within the pet’s body.

To confirm an infestation of external parasites, vets may do an antigen-antibody test using blood to detect antibodies that are present if a dog has been exposed to certain types of parasites. This test can provide accurate results on the species and varieties of parasites in your dog’s system.

Once external parasites are confirmed with diagnostic tests, vets can begin treatment options such as topical ointments, spot treatments or oral medications depending on the severity and species/type of parasite identified during testing. Owners must comply with their vet’s recommended treatment guidelines to ensure that all external parasite infestations have been eliminated from their pet’s body.

Treatment for External Parasites in Dogs

Treatment for external parasites in dogs

Treating these parasites is essential because they can cause serious health problems. For example, fleas can transmit tapeworms, leading to liver disease. Ticks can carry Lyme disease. Lice can spread heartworm disease. In addition, worms can cause intestinal blockages.

If you suspect your pet may be infected with these parasites, immediately take them to the vet. The sooner treatment begins, the better off your pet will be.

Vets usually recommend treating external parasites with home remedies and prescription drugs. However, some pets may need stronger medications.

Here are some common treatments for external parasites in dogs:

  1. Flea collars – These work well when used correctly. The collar should be applied at night, and the pet must wear it until the fleas die off naturally (usually within two weeks).
  2. Shampoo – This works well, too, especially if combined with a flea collar.
  3. Medicated shampoosSome medicated shampoos contain permethrin, which kills fleas and ticks. Be careful not to use these shampoos near children or animals because they can harm them.
  4. Spay/neuter – Many veterinarians recommend spaying or neutering outdoor pets. This prevents unwanted puppies and kittens from being born.
  5. Antifungal shampoo – Antifungal shampoo helps prevent ringworm. Ringworm is a fungus that causes red patches on the dog’s skin.
  6. Parasite drops – These drops help control internal parasites in dogs. Internal parasites include roundworms, hookworms, whipworms, tapeworms, and giardia.
  7. Worming tablets – These pills kill worms inside the body.
  8. Antiinflammatory topical ointments – Ointments containing anti-inflammatories relieve pain and itchiness associated with external parasites.
  9. Insect repellent – Pet owners often apply insect repellents to protect their pets against insects.
  10. Bedding – Bedding made from natural fibers, such as wool, cotton, or silk, reduces the risk of getting external parasites.
  11. Bathing removes dirt and debris from the coat, reducing the chances of getting external parasites.

External Parasites Prevention in Dogs

Preventative measures are typically used to control internal parasites in dogs, while topical treatments are usually reserved for external ones. Both methods are effective, but each has advantages and disadvantages.

Prevention is generally recommended over topical treatments. While topical treatments can kill parasites, they aren’t always 100% effective. Fleas, for example, can survive off of a dead host for weeks after treatment. Prevention is much easier to maintain, preventing heavy flea infestations that may lead to severe skin disease.

The first thing you need to do is wash your hands thoroughly after handling your pet. Make sure to clean under his nails and inside his ears. Then, brush him regularly to remove dead skin cells and hairballs. Finally, bathe him frequently to remove dirt and debris.

Next, look for signs of internal parasites. These are usually easier to spot than external ones since they tend to manifest themselves in different ways. Some common symptoms include diarrhea, vomiting, and weight loss.

To prevent internal parasites, feed your dog a healthy diet. For example, avoid feeding him foods that contain raw meat, bones, or dairy products. Also, avoid giving him treats, including chocolate, raisins, grapes, onions, garlic, or caffeine.

Lastly, watch out for fleas. Fleas love warm weather, so keep your house cool during summer.

Please keep your dog indoors whenever possible, and apply insect repellent to his coat.

Be sure to consult your veterinarian if you notice any unusual behavior. He can perform blood tests to detect diseases caused by parasites.

Both prevention and topical treatments are safe and easy to administer. Follow label instructions closely and watch for signs of allergic reactions. Ensure you wash your hands thoroughly after applying anything to your dog’s body.

Frequently Asked Questions

There are many ways to treat these parasites. The most common way is with medication. The medication comes in different forms, such as pills, liquids, sprays, powders, ointments, shampoos, collars, etc. There are some natural remedies too. For example, some herbs help kill parasites. However, you should consult your veterinarian before trying any home remedy.

A physical examination is the most common way to determine whether your dog has skin parasites. The veterinarian will thoroughly examine your pet’s body and look for signs of skin parasites such as fleas, ticks, mites, lice, etc. You should immediately take your dog to the vet if you notice any symptoms of these parasites.

If you don’t see any signs of parasites, then there could be another reason why your dog’s skin looks terrible. It might be because they are allergic to food or pollen. You can ask your vet to check your dog’s ears and nose for signs of allergies.

Parasites can spread from dogs to people through flea bites, ticks, lice, mites, worms, etc. The tapeworm is the most common parasite that spreads from dogs to humans (Taenia Solium). It is usually found in the feces of infected animals, especially pigs and cattle. This parasite causes taeniasis. Symptoms include abdominal pain, diarrhea, nausea, vomiting, weight loss, fatigue, headache, fever, joint pains, muscle aches, and weakness. Left untreated, this infection can cause serious complications such as intestinal blockage, liver failure, seizures, coma, and death.

External parasites cause many different types of illnesses. These include malaria, schistosomiasis, filariasis, trichinosis, toxocariasis, ascariasis, pinworm infections, hookworms, roundworms, tapeworms, whipworms, threadworms, flukes, tapeworms, and others.

The most effective way to get rid of external parasites is with proper treatment from your veterinarian. Spot-on products applied directly to your pet’s fur help kill adult fleas and ticks and disrupt their life cycle. Additionally, your vet may offer oral products that prevent or eliminate multiple types of these pests.

In addition, taking steps around your home can help reduce the number of external parasites that could affect your dog. For example, regular vacuuming on carpets and furniture is recommended to remove any eggs left behind by insects or mites. At the same time, weekly washes will help keep bedding clean and free of potential carriers. Finally, it is essential to regularly inspect dogs for any visible signs of external parasites such as fleas and ticks; if found, they should be treated immediately before they spread throughout the household environment.

Finally, some natural approaches can also relieve external parasite infestations in dogs, including apple cider vinegar baths and regularly combing with a flea comb that helps attract adult fleas out of its fur with unique teeth designed for this purpose.

External parasites are usually spread between pets through direct contacts, such as play or grooming sessions. The most common carriers for transferring pests are other animals and humans carrying the same pests or species of pests on their fur or clothes. Fleas, mites, and lice jump between hosts, while ticks cling onto their new host until they are full of blood.

Yes, dogs can survive parasitic infections. Many parasites are not harmful to dogs and can be eliminated with good deworming treatment. Others, such as heartworms, require specific veterinary care beyond this article’s scope.

Dogs are susceptible to several parasites, including worms. When these parasites excrete their eggs in the dog’s feces or vomit, they can be picked up by other animals and transmitted to humans. Parasitic infections in dogs can cause vomiting, diarrhea, anemia, liver problems, and more. If left untreated, some parasitic infections may lead to death.

Fleas are the most common external parasite found in Australian dogs. They can majorly cause itching and scratching, leading to skin infections. Ticks are also prevalent parasites in Australian dogs, and they can transmit diseases such as Lyme disease, and Rocky Mountain spotted fever. Mites are less commonly seen, but they can still cause problems if unnoticed.

Disclaimer: The information provided on this veterinary website is intended for general educational purposes only and should not be considered as a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a licensed veterinarian for any concerns or questions regarding the health and well-being of your pet. This website does not claim to cover every possible situation or provide exhaustive knowledge on the subjects presented. The owners and contributors of this website are not responsible for any harm or loss that may result from the use or misuse of the information provided herein.

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