Lyme disease is carried by the small deer tick, and even though it is cold in many places, the ticks are still active anytime the temperatures are above 32 degrees Fahrenheit. The tick is so small that you rarely ever see it on the dog, especially long-haired dogs. All of my dogs wore flea and tick collars, and they were very effective with tick prevention, but that was before the more modern type of chemical application directly to the dog's skin. That was the most effective tick control that I used on the dogs in the last 10 years or so.
