The Lyme's disease blood test, as I understand it, tests for the antibodies to Lyme's disease. So....you can get a positive for several reasons, including, but not limited to:
- Your dog has received the Lyme's vaccine and therefore has antibodies
- Your dog had Lymes disease in the past and now has the antibodies to it
So...to answer your question, I would not treat a dog just because it showed a positive Lyme test because I am not comfortable giving antibiotics as strong as the ones used for Lymes disease if the dogs were not symptomatic.
On the other end of the spectrum....you can test negative to Lymes disease and still have it because your body has not yet produced the antibodies, and yet you have symptoms.
It is not a black and white situation. There are lots of blurried points in between and many people share different opinions.
does that help any?
And...I again say, I can be wrong on these points.