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Dogs + Parasites

  • Cuterebra are botflies that spend the larvae stage of their lifecycle within rodent or rabbit hosts and can accidentally infect dogs. They enter through the nose, mouth or a skin wound. They usually develop a cyst under the skin that can be located as it enlarges and often a breathing hole can be seen. The larva (warble) will leave the dog when it is ready to form a pupa but it will often leave behind a secondary bacterial skin infection or abscess in the empty cyst. Rarely, the larva/cuterebra migrate aberrantly through the dog causing inflammation and damage to different tissues, including the brain and eyes, and even potentially cause a severe systemic inflammatory response. Treatment depends on what damage has been done and can include removal of the warble, debridement or removal of the cyst, antibiotics and symptomatic and supportive treatment of the results of aberrant migration. Prognosis is generally good if only the skin is involved. Cuterebra infection can not be prevented easily, so monitoring the dog regularly for signs is important.

  • Demodectic mange is caused by a parasitic mite that lives in the hair follicles of dogs. As long as the body's immune system is functioning properly, these mites cause no harm. Demodectic mange most often occurs when a dog has an immature or weakened immune system, allowing the number of skin mites to increase rapidly. Topical, oral, and injectable medications are available to treat demodectic mange.

  • Diarrhea is a symptom of an underlying problem that may be minor or very serious. Some cases may resolve on their own or with minimal treatment, while other cases require in-depth diagnostic testing and more aggressive treatment to address the underlying condition. The possible causes, diagnostic tests, and treatment protocols for diarrhea in dogs are numerous and are explained in this handout.

  • The ear mite is a surface mite that lives on cats, dogs, rabbits, and ferrets. It is usually found in the ear canal but it can also live on the skin surface. Mites are barely visible to the naked eye. Clinical signs of infestation vary in severity and may include ear irritation, leading to scratching at the ears or head shaking, dark waxy or crusty discharge from the ear, areas of hair loss resulting from self-trauma, a crusted rash around or in the ear, and an aural hematoma. Your veterinarian will advise you about which insecticidal products are suitable. Your veterinarian may want to re-examine your pet to ensure that the mites have been eliminated after the initial treatment has been performed.

  • Echinococcosis refers to being infected with a tapeworm of the genus Echinococcus and is primarily a parasite of coyotes and foxes. Infected dogs are usually asymptomatic, but in both dogs and humans the parasite can cause large cysts to form within the lungs and liver. E.multilocularis is treated with praziquantel and in most cases the prognosis is good.

  • Fleas are the most common nuisance and parasite affecting dogs, and an infestation can lead to serious health problems. Flea control requires a three-pronged approach; they need to be eliminated from 1) your dog, 2) any other cats and dogs that you have, 3) your home and yard. There are many flea control products available and your veterinarian can help you determine which are the safest and most effective for your pets.

  • Fluralaner is given by mouth or applied topically and is used to treat flea and tick infestations, and also off-label to treat certain types of mange and mites. Give as directed. Side effects are uncommon but may include stomach upset or neurologic symptoms. Do not use in pets with a history of seizures. If a negative reaction occurs, please call the veterinary office.

  • Giardiasis is an intestinal infection of man and animals caused by a protozoan parasite Giardia intestinalis (also known as Giardia lamblia). Giardia is a simple one-celled parasitic species; it is not a "worm", bacteria or virus. The parasite occurs worldwide and is a common cause of "Traveler's Diarrhea" in people.

  • Harvest mites, also known as red bugs, trombiculid mites, scrub-itch mites, berry bugs or, in their larval stage as chiggers, are mites that are commonly found in forests and grasslands. Harvest mites are relatives of spiders. They are nearly microscopic measuring only 1/100 of an inch (0.4 mm) and have an orange hue. A common species of Harvest mite in Northern America is Trombicula alfreddugesi.  

  • Heartworm disease is a serious and potentially fatal disease. It is caused by a blood-borne parasite known as Dirofilaria immitis. Adult heartworms may live for five to seven years and, during this time, the female produces millions of offspring called microfilaria. You can prevent your dog from getting heartworms by using a heartworm preventive.