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Lyme Disease in Dogs

Lyme disease, caused by the bacteria Borrelia burgdorferi, is transmitted through the bite of a tick. It affects domestic animals (dogs, horses, possibly cats) and humans. Lyme disease is most commonly transmitted by bites from the deer tick, also known as the blacklegged tick. Ticks themselves do not cause Lyme disease; however, they do carry and transmit the bacteria that does. Once a tick attaches, it takes one to two days for it to transmit the bacteria that causes Lyme disease, so the prompt removal of ticks is important for disease prevention.

In Canada, blacklegged ticks are most often found in southern British Columbia, southeastern and south-central Manitoba, southern, eastern and northwestern Ontario, southern Quebec, southern New Brunswick and Grand Manan Island and parts of Nova Scotia. Blacklegged ticks are spreading elsewhere in Canada as a result of climate change and other factors. Established populations of blacklegged ticks have not been identified in Saskatchewan; however, infected ticks may be dropped off of migrating birds. This would explain the occasional cases of Lyme disease found in dogs that have not travelled outside of Saskatchewan. If you find a tick on yourself or your pet(s), consider submitting a photo to the eTick website for identification and to contribute to nationwide tick surveillance.

Unlike people, many animals infected with Lyme disease show no clinical signs. Infection in apparently healthy dogs may be detected during routine screening. When clinical signs are present in dogs, fever, loss of appetite, painful or swollen joints, lameness that comes and goes, swollen lymph nodes and lethargy may be seen. If Lyme disease is left untreated, it can lead to damage in the kidneys, nervous system and heart.

Antibiotics are used to treat Lyme disease in dogs. Rapid improvement is usually seen in limb and joint disease; however, some dogs do not recover completely. Infection in animals may persist in spite of antibiotics and may require a second round of treatment. Additional treatments to help affected organ systems may be needed when the disease affects the kidneys, heart or nerves. Some animals may experience permanent joint damage from the infection.

Prescription tick medication can be prescribed for dogs and cats through your veterinarian. Not only does this help protect your pets from ticks and tick-borne diseases like Lyme disease, but it also reduces the number of ticks that you and your family members may be exposed to, in addition to the diseases ticks may carry.

Lyme disease is a provincially notifiable disease. Saskatchewan veterinarians are reminded to notify the Ministry of Agriculture’s Disease Surveillance Veterinarian following any confirmed cases of Lyme disease. This includes any cases identified on in-clinic tests.

The following table is a list of confirmed cases of canine Lyme disease occurring in Saskatchewan, from April 2014 to December 2022.

Diagnosis Date Species Case Location History of Out of
Province Travel?
14-Mar-15 Dog Wakaw, SK No
1-Sep-15 Dog Yorkton, SK Yes
11-Sep-15 Dog Esterhazy, SK Yes
21-Sep-15 Dog Saskatoon, SK No
1-Oct-15 Dog Wolseley, SK No
27-Feb-16 Dog Saskatoon, SK Yes
22-Mar-16 Dog Rosthern, SK Yes
4-May-16 Dog Flin Flon, MB No
1-Sep-16 Dog Saskatoon, SK No
15-Nov-16 Dog Moosomin, SK Yes
2-Nov-16 Dog Lumsden, SK Yes
8-Mar-17 Dog Regina, SK Yes
7-Apr-17 Dog Moose Jaw, SK Yes
3-Jun-17 Dog Regina, SK Yes
12-Mar-18 Dog Saskatoon, SK Unknown
2-Aug-18 Dog Yorkton, SK Yes
25-Jun-19 Dog Kindersley, SK Yes
27-Dec-19 Dog Saskatoon, SK No
16-Jan-20 Dog Yorkton, SK Unknown
27-Feb-20 Dog Regina, SK Yes
13-Mar-20 Dog Saskatoon, SK Yes
15-Jun-20 Dog Estevan, SK Yes
15-Jul-20 Dog Saskatoon, SK No
10-Oct-20 Dog Saskatoon, SK No
24-Jan-22 Dog Lintlaw, SK Yes
22-Jul-22 Dog Outlook, SK Unknown
28-Jul-22 Dog Regina, SK Unknown
8-Aug-22 Horse Moose Jaw, SK Yes
25-Aug-22 Dog Maple Creek, SK Yes
25-Aug-23  Dog Melville, SK Yes

For more information on Lyme disease including public health impacts, visit the Ministry of Health’s page on Lyme disease.

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