Lyme disease, also known as Lyme borreliosis, is a tick-transmitted disease that affects dogs, horses, and to a much lesser extent, cats. It is caused by the bacterium Borrelia burgdorferi, which is most commonly carried by the deer tick. In Asia, Ixodes ricinus and Ixodes persulcatus are the primary vectors - these hard-bodied ticks don't cause Lyme disease themselves, but they can transmit the bacteria to dogs.
Grassy areas with thick brush, marshes, and forests are considered high-risk areas for the deer tick. These ticks can latch on to the dog’s body as it brushes against the blades of grass or leaves; ticks cannot fly so they lie in wait on these surfaces.
In dogs, the infection does not spread until 24-48 hours after the tick attaches to the dog's body. Spring and autumn are considered high-risk seasons since that is when the ticks are actually searching for hosts. Lyme disease does not spread from pet to pet or pet to human.
However, since you are likely to have been in the same places as your pet, it is a good idea to get yourself checked for Lyme disease should your pet have it. In humans, a tick bite stands out. A classic symptom of Lyme disease in humans - a "bulls-eye" or target rash - does not appear in dogs.
Instead, the symptoms of Lyme disease in dogs include generalised pain, limping, loss of appetite and fever. In some cases, if the disease has affected the kidneys, the dog may also experience vomiting, lethargy and weight loss.