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Lyme disease, also known as Lyme borreliosis, is a bacterial illness that can be transmitted to humans, dogs, and other animals by certain species of ticks. It is caused by the spiral-shaped bacterium Borrelia burgdorferi that is carried inside a tick and gets into a dog or person’s bloodstream through a tick bite. Once in the bloodstream, the bacteria can travel to different parts of the body and cause problems in specific organs or locations, such as joints, as well as overall illness.
Given the seriousness of Lyme disease, it’s important to be aware of tick prevention and treatment for dogs.
The ticks that carry Lyme disease are especially likely to be found in tall grasses, thick brush, marshes, and woods — waiting to latch onto your dog when he passes by. A tick can transmit the disease once it has been attached to a dog for 24 to 48 hours.
First named when a number of cases occurred in Lyme, Connecticut, in 1975, the disease can be hard to detect and can cause serious, ongoing health problems in both dogs and people.
Lyme disease happens in every state, but infection risks vary. Over 95% of cases are from the Northeast, the Upper Midwest, and the Pacific coast, although with recent changes in deforestation, migrating deer, and bird populations, percentage rates in these areas are constantly changing.
A small number of cases crop up each year along the West Coast, especially Northern California. In Canada, Lyme-positive dogs are found mostly in southern Ontario and southern Manitoba. A smaller number of cases are reported each year in Southern Quebec and the Maritime Provinces.
What are the clinical signs of Lyme disease?
Some people with Lyme disease develop a characteristic bulls-eye rash at the site of the bite within three to thirty days. If this occurs, the disease can be easily diagnosed at an early stage.
However, signs of Lyme disease are more difficult to detect in animals than in people. The characteristic rash does not develop in dogs or cats. In fact, Lyme disease is practically unheard of in cats.
Many dogs affected with Lyme disease are taken to a veterinarian because they seem to be experiencing generalized pain and have stopped eating. Affected dogs have been described as if they were walking on eggshells. Often these pets have high fevers. Dogs may also begin limping. This painful lameness often appears suddenly and may shift from one leg to another. If untreated, it may eventually disappear, only to recur weeks or months later.
Some pets are infected with the Lyme disease organism for over a year before they finally show symptoms. By this time, the disease may be widespread throughout the body. Non-specific signs which may indicate that Lyme disease is affecting the kidneys include vomiting, lethargy, anorexia (lack of appetite), and weight loss. The kidney form of the disease is less common, but often fatal.
Dogs with lameness, swollen joints, and fever are suspected of having Lyme disease. However, other diseases may also cause these symptoms. There are a few blood tests that may be used for confirmation. The first is an antibody test, that your veterinarian can perform in the clinic setting using a special test kit. This test detects the presence of antibodies created by exposure to the organism. A test can be falsely negative if the dog is infected, but has not yet formed antibodies, or if it never forms enough antibodies to cause a positive reaction. It is recommended to test no earlier than 4 weeks after a tick bite. Some dogs that have been infected for long periods of time may no longer have enough antibodies present to be detected by the test. Therefore, a positive test is meaningful, but a negative is not. A follow up test called a QC6 test can be done to assess the numerical antibody level as confirmation.
Other tests including PCR (polymerase chain reaction), ELISA (enzyme-linked immunosorbent assay), joint fluid analysis, and culture can also be done with varying degrees of sensitivity, but are done less commonly. General blood and urine tests are also often done to assess kidney function and look for loss of protein in the urine. See handout “Testing for Lyme Disease in Dogs” for further information.
Because the Lyme spirochete is a bacterium, it can be treated with antibiotics. The antibiotic of choice is doxycycline, followed by amoxicillin, then azithromycin. Treatment lasts for 4 weeks. Occasionally, the initial infection will recur, or the pet will become re-infected by being bitten by another infected tick.
What are the symptoms of Lyme Disease in Dogs?
Lyme disease is, unfortunately, a fairly common canine disease. Typical symptoms in dogs include:
Symptoms can progress to kidney failure, which can be fatal. Serious cardiac and neurological effects can also occur.
Symptoms of Lyme Disease in Dogs- And Why It’s SO Dangerous – Professional Dog Training Tips
Lyme disease (Lyme borreliosis) is an illness that affects both animals and humans – what is known as a zoonotic disease – and is the most commonly reported vector-borne illness in the United States, according to the U.S. Centers for Disease Control and Prevention (CDC). Transmitted through tick bites, the disease can be difficult to detect and can cause serious and recurring health problems. Therefore, it is best to prevent infection by taking appropriate measures to prevent tick bites and, for dogs, possibly vaccinating against the disease.
The bacterium that causes Lyme disease – a worm-like, spiral-shaped bacterium called Borrelia burgdorferi – is carried and transmitted primarily by the tiny black-legged tick known as the deer tick. Deer ticks are found in forests or grassy, wooded, marshy areas near rivers, lakes or oceans. People or animals may be bitten by deer ticks during outdoor activities such as hiking or camping, or even while spending time in their back yards.
Named after numerous cases were identified in Lyme, Conn., in 1975, the disease has since been reported in humans and animals across the United States and around the world. Within the U.S., it appears primarily in specific areas including the southern New England states; eastern Mid-Atlantic states; the upper Midwest, particularly Wisconsin and Minnesota; and on the West Coast, particularly northern California. The CDC maintains a map detailing confirmed cases of Lyme disease throughout the years.
Lyme disease is a reportable disease – which means that health care providers and laboratories that diagnose cases of laboratory-confirmed Lyme disease are required to report those cases to their local or state health departments, which in turn report the cases to the CDC.
As noted above, there are preventive Lyme disease vaccines available for dogs, but they arent necessarily recommended for every dog. Consult your veterinarian to see if the vaccination makes sense for your pets. If your veterinarian does recommend that your dog be vaccinated against Lyme disease, the typical protocol will involve an initial vaccination followed by a booster 2-4 weeks later and annual boosters after that.