Brown Tick

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Overview/Risk of Canine Anaplasmosis or Dog Tick Fever

Ticks are not only disgusting little blood-sucking creatures, they are dangerous, too. Ticks are one of the primary couriers for transmitting certain infectious diseases, collectively called “vector-borne [or, tick-borne] diseases,” of which canine anaplasmosis is one. Canine anaplasmosis can be found throughout the United States, primarily in the northeastern, mid-Atlantic, and north-central states, as well as in California.

To see if anaplasmosis is in your area, visit the interactive map at and click on your region.

One form of this disease is spread to your dog from the black-legged tick, also referred to as the deer tick, which also transmits Lyme disease. Another form can be passed to your best friend from the brown dog tick.

If you’re interested in what ticks look like and the different types of ticks lurking, visit (if you haven’t gathered, we think it’s a great resource for pet-owners who want to know more about tick-borne diseases).

So, how do these nasty ticks infect your dog with anaplasmosis? Ticks acquire the bacteria that cause the disease from feeding on an infected host animal, such as a rodent or a deer. Then, they pass the bacteria to your four-legged friend by biting him and ingesting his blood.

Signs of Canine Anaplasmosis

If Fido has been infected with anaplasmosis, he may exhibit some of the following signs:

  • Joint pain and stiffness similar to the symptoms of arthritis
  • High fever
  • Lethargy
  • Loss of appetite
  • Vomiting
  • Diarrhea
  • Neurological signs resulting in seizures and neck pain (infrequent)
  • Diagnosis/Treatment

Although the two forms of anaplasmosis present with different signs, both may pose a serious threat to your dog’s health and can be difficult to diagnose, based on clinical signs alone.

Upon examination, if your veterinarian suspects an infection they may recommend the following tests:

  • Baseline bloodwork, including a complete blood count (CBC), chemistry tests, and urinalysis to evaluate organ function and blood-related conditions, such as anemia and clotting abnormalities.
  • An antibody test to identify if your pet has been exposed to the organism that causes anaplasmosis
  • Electrolyte tests to ensure your dog isn’t dehydrated or suffering from an electrolyte imbalance
  • PCR testing to detect the organism in the blood in the early stages of infection

If your dog has been infected with anaplasmosis and is clinically ill, your veterinarian will most likely prescribe an antibiotic, such as doxycycline or tetracycline. The good news is that, in most cases, symptoms begin to resolve within 1–4 days! Your veterinarian may recommend repeating the CBC after your pet has been on medication for a period of time, to make sure the antibiotic treatment has been effective. In more severe cases, some dogs require other medications or hospitalization.


Protecting your best friend from ticks is the most important step in preventing her from contracting any tick-borne disease! Because the signs of tick-borne diseases, like anaplasmosis, are so varied, it is vital that you have your pet screened routinely for these vector-borne diseases.

The good news is there are several ways to protect your pet and very effective tick-prevention products and medications available both over the counter and from your veterinarian. To learn more about these products, as well as more about how you can prevent your pet from being bitten by a tick, we recommend (again) you visit

Laurelwood Animal Hospital, located near Jesuit High School on Beaverton-Hillsdale Highway offers a full range of companion animal services, including surgery, nutrition and behavior counseling, parasite control and preventative medicine. The hospital also offers advanced imaging through an all-digital spiral CT scanner, a comprehensive dental program and laser treatment.

If you’re looking for quality, compassionate veterinary care in Beaverton, Oregon, come visit us at Laurelwood Animal Hospital.

Laurelwood Animal Hospital

9315 SW Beaverton-Hillsdale Highway
Beaverton, Oregon 97005

Phone: (971) 244-4230
Fax: (503) 292-6808

E-mail: [email protected]