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Tick-borne disease is a growing threat to both canine and human health.聽Ticks are parasites that attach themselves to animals and people, feed on blood, and transmit diseases directly into the host鈥檚 system. The disease occurs when an infected tick bites a dog or a human and transmits the disease into the victim鈥檚 body.

The geographic distribution of ticks is changing due to climate change, de-foresting, and the changing living and migrating patterns of deer, birds, and rodents. This can vary yearly or even by season. Ticks are in virtually all parts of the United States, including some urban areas, and many parts of the world. They present a danger to both people and pets.

The most important tick-borne diseases that affect dogs are Lyme disease, Ehrlichiosis, Anaplasmosis, Rocky Mountain Spotted Fever, Babesiosis, Bartonellosis, and Hepatozoonosis. All can have serious health consequences for dogs and many can have serious health consequences for people as well.

Lyme Disease

Lyme disease is an infectious disease caused by a spirochete bacteria (Borrelia) carried by the Black-Legged Tick (more commonly known as the Deer Tick). This disease has typically been associated in the Northeast and upper Midwest areas of the United States. However, we are now also seeing it on the West Coast (Washington, Oregon, and California), as well as in Florida. In fact, Lyme has been detected on dogs in many parts of the country and also in some areas of southern Canada. The tick has to be attached to its host for about 36-48 hours for transmission of bacteria into the host. Signs of illness occur about 2-5 months after a tick bite.

It鈥檚 important to do a thorough check for ticks and remove them promptly after a walk in the woods or other grassy or shaded areas where ticks may reside. In urban areas, that may include your local dog park.

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Signs of聽Lyme disease聽may include聽fever, lameness, limping, joint pain/swelling, enlargement of lymph nodes, and lethargy. Lyme disease can progress to聽kidney disease, which can become fatal. (Unlike Lyme in humans, dogs do NOT develop a 鈥渂ull鈥檚 eye鈥� rash.)

A veterinarian will usually use blood tests to diagnose a dog with Lyme disease. The initial test detects exposure to the tick-agent and helps the veterinarian determine additional testing as needed.

The treatment of a dog that is positive on the initial test but is otherwise healthy remains controversial amongst some veterinarians. When a veterinarian decides to treat a dog with Lyme, they鈥檒l usually place the dog on for 28-30 days.

There is a vaccination for Lyme disease and plenty of other . Though some question its duration and efficacy, the vaccine may reduce the rate and severity of the illness should it appear. Dog owners should speak to their veterinarian to determine if the vaccine is appropriate for their pet.

Canine Ehrlichiosis

Canine Ehrlichiosis is found worldwide. It is : The Brown Dog Tick, Lone Star Tick, and Black-Legged Tick. Signs include fever, poor appetite, and low blood platelets (cells that help the clotting of blood), often noted by nose bleeds or other signs of bruising or anemia. Signs start about 1-3 weeks after the bite of an infected tick. Dogs diagnosed and treated promptly can have a good prognosis, but those who go on to the chronic phase have more difficulty recovering.

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Anaplasma

Anaplasma is a disease caused by a (Ixodes). Though Anaplasma is seen worldwide, there are two Anaplasma species known to detect disease in North American dogs:

• Phagocytophilum: Northeast and the upper Midwestern United States
• Platys: California and coastal states

The signs are similar to Lyme disease, though dogs with Anaplasma often have low blood platelets, which cause bleeding disorders.

Rocky Mountain Spotted Fever

One of the more commonly known tick-borne diseases, Rocky Mountain spotted fever can affect dogs and humans. The American Dog Tick, Rocky Mountain Wood Tick, and Brown Deer Tick can carry the disease.聽This disease has been found in much of North, South, and Central America. Signs include fever, poor appetite, swollen lymph nodes, and joint pain. A dog may also have a low platelet count. Neurological signs, such as wobbliness, can sometimes occur.

Babesiosis

Babesiosis is another disease caused primarily by the bite of a tick, but can also transfer from dog bites, transplacental transmission, and possibly through contaminated IV blood. Multiple tick species can carry this disease. The main issue associated with Babesiosis is 鈥渉emolysis,鈥� or the breaking down of red blood cells. Symptoms include lethargy, pale gums, dark-colored urine, and jaundice.

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Bartonella

Bartonella is an emerging infectious disease in dogs, as well as cats and humans. Also known as cat scratch disease (CSD), most infections occur after a flea-infested domestic or feral cat scratches a dog. CSD can occur wherever there are cats and fleas.

Hepatozoonosis

Hepatozoonosis is slightly different, in that a dog acquires the infection after . This disease is not zoonotic and people cannot catch this from infected dogs. This disease is generally found in the southern United States. Signs of the disease are pain and reluctance to stand or move, fever, muscle wasting, and mild-to-moderate anemia. This disease is severely debilitating and often fatal.