2001-Tue Sep 26 14:21:14 EDT 2017
Vetstreet. All rights reserved. Powered by Brightspot.
Vetstreet does not provide medical advice, diagnosis, or treatment. See Additional Information ›
Ticks are trouble! We all know that they spread the bacteria that cause Lyme disease, but another tick-borne disease that is steadily increasing is ehrlichiosis. Once limited to western Texas, Oklahoma and Missouri, the incidence of ehrlichiosis is expected to rise in those areas, as well as in southern California and the southeastern United States, according to the Companion Animal Parasite Council.
Dogs with ehrlichiosis can develop an acute infection that starts with fever, appetite loss and lethargy. Two to four weeks after experiencing the bite of an infected tick, a subclinical infection can set in, causing thrombocytopenia. That $5 word means that the dog doesn’t have enough platelets in his blood. When that happens, he can experience bleeding into body tissues (known as petechiae) and bruising. His blood may clot more slowly than normal after an injury. Bone marrow suppression is often a result of chronic Ehrlichia spp. (the "spp." refers to all species of this type of bacteria) infection. It can appear months to years after a tick bite. Certain breeds — in particular, German Shepherds — tend to be predisposed to severe forms of ehrlichiosis.
Cats with the disease may show similar signs. Other signs seen in cats and dogs include weight loss, joint pain, vomiting and diarrhea.
Three tick species are known to spread the organism that causes ehrlichiosis. The brown dog tick (Rhipicephalus sanguineus), found throughout the United States, is the primary culprit, but the American dog tick (Dermacentor variabilis) and the lone star tick (Amblyomma americanum) can also transmit the bacteria that cause disease. You might think lone star ticks would be limited to the Lone Star State (Texas, of course), but they are found up from the southeastern U.S. and Texas through the Mid-Atlantic Seaboard all the way to New England. American dog ticks reside east of the Rockies, mainly in areas such as grassy fields, walkways and trails. They can survive for two or more years without a host.
Dogs (and cats) become infected with Ehrlichia spp. when infected ticks feed on them, injecting the bacteria into their blood by deeply burying their mouthparts into the skin. Nasty!
It can take as little as three to six hours for ticks to transmit the bacterial invaders. Once the bacteria enter the blood cells, they thrive, multiply and spread throughout the body. The disease is diagnosed based on a history of tick exposure, presence of signs, a platelet count and a positive blood test result for the bacteria that cause the disease: Ehrlichia canis (the primary cause in dogs), Ehrlichia ewingii (seen in dogs and humans) and Ehrlichia chaffeensis (the primary cause in humans). Ehrlichiosis isn’t always easy to diagnose, because it can take time for antibodies to develop, but response to treatment with doxycycline is a good clue that your veterinarian has found the cause of your dog’s symptoms.
Like this article? Have a point of view to share? Let us know!
Take our breed quiz to find your next pet.
Bartonella is a type bacteria that can be transmitted to cats, dogs and humans from exposure to infected fleas and…
Want to give your pup yummy, low-calorie treats? We’ve got the skinny on which foods are OK to feed him.
Not sure about food puzzles? Our veterinarian reveals why the payoff for your pet is well worth any extra work.
With these simple dental care tips, you can help keep your canine’s adorable smile shiny and healthy for life.
The friendly and inquisitive LaPerm has an easy-care coat that comes in a variety of colors and patterns.
Check out our collection of more than 250 videos about pet training, animal behavior, dog and cat breeds and more.
Wonder which dog or cat best fits your lifestyle? Our new tool will narrow down more than 300 breeds for you.
If the video doesn't start playing momentarily,
please install the latest version of Flash.
Thank you for subscribing.