Anaplasmosis in dogs is not contagious to humans through direct contact. You cannot catch it from your dog’s saliva, urine, blood, or by sharing a living space. Both dogs and humans get anaplasmosis the same way: from the bite of an infected tick. The real risk your dog poses isn’t as a source of infection itself, but as a vehicle that carries ticks into your home and yard.
Why Your Dog Can’t Give You Anaplasmosis
Anaplasmosis is caused by bacteria called Anaplasma phagocytophilum, which live inside certain types of white blood cells. The bacteria require a tick bite to move from one host to another. As Cornell University’s veterinary school puts it, anaplasmosis “can infect multiple mammal species but is not directly transmittable between animals, including, but not limited to dogs, cats, horses, cows, sheep, goats and humans.” The only documented non-tick route of transmission in humans is through blood transfusion, and that’s rare.
So petting your dog, cleaning up after them, or even coming into contact with their blood during wound care does not put you at risk. The bacteria simply don’t transmit that way.
The Real Risk: Ticks Hitching a Ride
While your dog can’t infect you directly, a dog with anaplasmosis signals something important: infected ticks are in your environment. And your dog may be bringing those ticks closer to you. A CDC study found that households with pets had 1.83 times the risk of finding ticks crawling on family members and 1.49 times the risk of finding ticks attached to family members, compared to pet-free households.
The numbers get more striking when ticks are already showing up on your pet. In those households, the odds of a family member finding a tick crawling on them jumped to 2.69 times higher, and the odds of finding one attached rose to 2.5 times higher. Dogs that spend time outdoors can pick up unattached ticks in their fur, which then drop off inside the house and seek a new host. That new host could be you.
Two tick species carry the anaplasmosis bacteria in the United States: the blacklegged tick (sometimes called the deer tick) and the western blacklegged tick. These same ticks also transmit Lyme disease, which means if your dog tested positive for anaplasmosis, you’re living in an area where multiple tick-borne diseases are circulating.
What Anaplasmosis Looks Like in Dogs
Dogs with anaplasmosis often develop lethargy, fever, joint pain, and loss of appetite. Some dogs limp or seem stiff, particularly in the legs. Veterinarians typically diagnose it through blood tests that check for antibodies or detect the bacteria directly. Many dogs test positive on routine screening without showing obvious symptoms, which can make it easy to miss early on.
Treatment for dogs, like for humans, centers on the antibiotic doxycycline. Most dogs improve within a few days of starting treatment, though the full course of medication needs to be completed.
What Anaplasmosis Looks Like in Humans
If you are bitten by an infected tick, symptoms typically appear within 5 to 14 days. Many people never notice the bite itself. Early symptoms feel a lot like the flu: fever, chills, severe headache, muscle aches, and general fatigue. About 20% of people also experience nausea, vomiting, or diarrhea. A rash is uncommon with anaplasmosis alone. If you develop a rash alongside these symptoms, it may suggest a co-infection with Lyme disease or another tick-borne illness.
Most cases resolve with prompt treatment. Doxycycline is the standard antibiotic for all ages, typically prescribed for 10 to 14 days. The longer course helps cover the possibility of concurrent Lyme disease, since the same ticks carry both. In severe or untreated cases, anaplasmosis can progress to kidney failure, respiratory problems, or neurological complications, but this is uncommon when treatment starts early.
How to Protect Your Household
Since the shared risk factor is tick exposure rather than dog-to-human transmission, prevention means keeping ticks off both your dog and yourself. Using a veterinarian-recommended tick prevention product on your dog year-round is one of the most effective steps you can take. These products kill or repel ticks before they have a chance to drop off your pet and find you. Keeping your dog protected reduces the number of live ticks entering your home significantly.
Beyond treating your dog, check yourself and your family for ticks after spending time outdoors, especially in wooded or grassy areas. Pay attention to hidden spots like the scalp, behind the ears, under the arms, and along the waistline. Ticks generally need to be attached for 24 to 48 hours before they can transmit anaplasmosis bacteria, so finding and removing them quickly matters.
In your yard, keeping grass mowed short, clearing leaf litter, and creating a barrier of gravel or wood chips between lawn areas and wooded edges can reduce the tick population near your home. If your dog has been diagnosed with anaplasmosis, treat it as a signal to tighten up tick prevention for every member of the household, two-legged and four-legged alike.