I would not reccommend Lyme vaccines even in endemic areas. Dogs just don't react to Lyme's Disease like people and alot of dogs test positive and never have any symptoms. If they do exhibit symptoms then a couse of doxy is prescribed. I went onto IVIS.org (my trusty info site for all sorts of info only most vets get.. ok I posed as a student and subscribed

) and found this article, among others that pretty much say the same exact thing. I only pasted relevant parts of the article.. it talks about stuff not really pertaining to Lyme's (ie other tick borne illnesses and Lyme's stats in affected people)
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In: NAVC Proceedings 2006, North American Veterinary Conference (Eds). Publisher: NAVC (
www.tnavc.org). Internet Publisher: International Veterinary Information Service, Ithaca NY (
www.ivis.org), Last updated: 11-Jan-2006.
Lyme Disease: What to Do When the Snap Is Positive
M.P. Littman
School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA.
ASYMPTOMATIC SEROPOSITIVE DOGS IN LYME-ENDEMIC AREAS
Since the SNAP test includes the heartworm antigen screening test, it is often used on healthy dogs. In endemic areas, veterinarians are finding many asymptomatic seropositive dogs with antibodies against the C6 peptide antigen on the SNAP test, which is a sensitive and specific test for natural exposure. Some veterinarians have decided not to use the SNAP test as their heartworm screening test precisely because they don't want to know the Lyme test results on a healthy dog. Finding a positive Lyme titer in those dogs may open a can of worms that many vets just don't want to deal with. It means educating ourselves and educating the owners. That takes time, work, even talent- maybe let's not go there. But the best veterinarians in my opinion are using the SNAP test, educating themselves, and communicating with owners, teaching them about tick control and public health issues and what there's evidence for and what there's not. I think owners really appreciate veterinarians who can do that.
Knowing the seroprevalence in healthy dogs in your community will help you assess the risk for exposure in your area. You will be able to emphasize to owners the importance of careful property landscaping as well as chemical tick control if you have the facts about seroprevalence in the neighborhood. Once you know the seroprevalence for Lyme positivity in your practice, you will also know what percentage of dogs sick with cancer, cruciate rupture, etc. will be seropositive just by chance, and that you should not be so quick to make a diagnosis of Lyme disease without doing a thorough work-up.
If you are using the SNAP test in a Lyme-endemic area, chances are you will see a lot of asymptomatic positive dogs. There are areas where 70 to 90% of the healthy and sick dogs are seropositive. A study in such an area showed no association with positive titer (or how high the titer was) for prediction of illness or severity of illness. The main questions we have when we get positive SNAP tests on healthy dogs are these: (1) Should we treat them? (2) What should we tell the owners? (3) Should we monitor them in some way? (4) Should we vaccinate them? Here are my answers.
Should We Treat Them?
I don't treat all asymptomatic Lyme-positive dogs. Most (>95%) will not get sick from Lyme disease. In some areas, 90% of the healthy dogs are Lyme-positive and I think treating all those dogs is not good medicine. Some dogs could have side effects from treatment, and using antibiotics rampantly (for one month, each dog) could cause general microbial resistance in our environment. Besides, there are studies that show that one month of antibiotics doesn't even clear all dogs of the carrier state. There are situations in which I do treat an asymptomatic dog, for instance, if it has proteinuria (see the question about monitoring below), or if the owner is very concerned about possible Lyme nephropathy for some reason.
What Should We Tell the Owners?
I tell the owners that their dog has been exposed to Borrelia burgdorferi, the agent of Lyme disease, and that most (>95%) seropositive dogs remain asymptomatic carriers in a premunitive state, and are not genetically predisposed to getting that sick with Lyme disease (different than in humans, where <10% are asymptomatic). I tell them about the experimental tick-exposure model of canine Lyme disease studied at Cornell, in which exposed 6- to 12-week-old Beagle puppies had no signs of illness until 2 to 5 months after exposure; then they had a 4-day illness that went away without treatment. The self-limiting illness included anorexia, fever, and lameness with joint swelling in the leg closest to the tick bite. Some pups had a few other episodes which were similar or even milder in the same leg or different leg, several weeks apart, but again these went away without any treatment. Older puppies had even less trouble and adult Beagles seroconverted without any signs of illness. Dogs are also different than humans in that dogs have no acute illness, whereas people often get flu-like signs and a rash soon after the tick bite. Other manifestations of Lyme disease seen in people, such as neurologic, cardiac, or skin signs are rare and not well-documented in dogs. Canine Lyme arthritis is usually very responsive to a short course of inexpensive, safe, oral antibiotics (doxycycline). I don't recommend treating healthy seropositive dogs because there is no evidence of benefit. Some dogs do seem to be genetically predisposed to having more serious forms of Lyme disease, which are probably immune-mediated diseases triggered by Lyme antigens, such as polyarthropathy (which is treated with doxycycline and sometimes steroids). If we're very unlucky, we may see immune-mediated glomerulonephritis and protein-losing nephropathy, especially in Labradors, Golden retrievers, and Shelties. That is why I recommend that all seropositive dogs be screened for proteinuria (see next question).
Should We Vaccinate These Dogs?
I do not recommend using Lyme vaccines. There is no evidence that Lyme vaccines help treat or clear the carrier state, and giving dogs Lyme antigens via vaccination may theoretically contribute to more immune-complex deposition in their kidneys or synovia, if they are so inclined. We stress good tick control in Lyme-endemic areas, because we have many tick-borne diseases to worry about besides Lyme disease.
References
1. Littman MP. Canine borreliosis. Vet Clin North Am Small Anim Pract 2003;33(4):827-862.
2. Littman MP. Lyme disease in dogs. Standards of Care: Emerg and Crit Care Med 2004;6(5):1-6.