Yes, there are several Lyme disease vaccines available for dogs, and they’ve been on the market for years. Unlike humans, who lost access to their only Lyme vaccine in 2002, dogs have multiple options that are widely available through veterinary clinics. The vaccine is classified as “non-core,” meaning it’s not recommended for every dog, but it’s routinely given to dogs in areas where Lyme-carrying ticks are common.
Available Vaccine Types
Canine Lyme vaccines fall into two categories: whole-cell bacterin vaccines and recombinant (subunit) vaccines. Bacterin vaccines contain killed whole bacteria from two strains of the Lyme-causing organism. Recombinant vaccines are more precisely engineered, using specific proteins from the bacteria’s outer surface rather than the entire organism.
The most recent vaccine to receive USDA approval is VANGUARD crLyme, made by Zoetis. It targets two proteins on the bacteria’s surface and is the only canine Lyme vaccine with a labeled duration of immunity lasting 15 months. Another well-known option is RECOMBITEK Lyme from Boehringer Ingelheim. Both are recombinant vaccines. Your vet can help determine which formulation makes sense based on your dog’s risk profile and what they stock.
How the Vaccine Works
The mechanism behind Lyme vaccines in dogs is unusual compared to most vaccines. Instead of fighting the bacteria after it enters your dog’s body, the vaccine kills it inside the tick before it ever gets transmitted. The Lyme bacterium lives in the tick’s gut and expresses a surface protein called OspA while it’s there. When a vaccinated dog is bitten, the tick ingests antibodies along with the blood meal. Those antibodies bind to the bacteria in the tick’s midgut and destroy them before the tick can push the organism into your dog. It’s essentially a preemptive strike that happens inside the tick itself.
Newer vaccines like VANGUARD crLyme also target a second protein, OspC, which the bacteria switch to expressing as they move from the tick into a host. This gives a backup layer of protection in case any organisms make it past the first line of defense. In comparative studies, this dual-target approach produced a broader immune response than vaccines targeting OspA alone.
How Well It Works
Reported efficacy in clinical trials ranges from 50% to 100%, a wide spread that reflects differences in study design, vaccine type, and how efficacy was measured. In a meta-analysis published in the Journal of Veterinary Internal Medicine, vaccinated dogs had 77% to 85% lower odds of developing the hallmark signs of Lyme disease, including lameness, fever, depression, and loss of appetite, compared to unvaccinated dogs.
Looking at individual challenge trials, where dogs are deliberately exposed to infected ticks, recombinant vaccines have performed consistently well. In multiple studies, zero out of the vaccinated dogs developed lameness, while unvaccinated control groups saw lameness rates as high as 75%. Bacterin vaccines also reduced symptoms significantly, though results were slightly more variable across trials. No vaccine offers 100% guaranteed protection, so tick prevention products remain important even for vaccinated dogs.
Side Effects
Lyme vaccines for dogs have a strong safety record. In a field safety study of VANGUARD crLyme involving over 1,200 vaccine doses, no serious adverse events were reported. The most common reaction was mild swelling at the injection site, occurring in about 3.8% of doses. Less than 1% of dogs vocalized (cried or whined) during the injection itself, and about 0.24% had a brief local skin reaction. Potentially serious reactions like anaphylaxis, seizures, or hives were not observed in any dog in the study.
Which Dogs Should Get It
The American Animal Hospital Association classifies the Lyme vaccine as non-core, meaning it’s recommended based on where your dog lives, travels, and how much time they spend outdoors in tick habitat. In regions where Lyme disease is endemic, particularly the Northeast, upper Midwest, and parts of the Pacific coast, many veterinary practices treat it as effectively core and recommend it for most patients.
Dogs that hike, hunt, or spend significant time in wooded or grassy areas face the highest risk. If you’re planning travel to a Lyme-endemic area, both initial doses should be completed two to four weeks before the trip. Your vet should reassess your dog’s risk at least once a year, especially as tick populations continue to expand into new regions.
Vaccination Schedule and Cost
Regardless of age, the initial series requires two doses given two to four weeks apart. After that, a single booster is given within one year of the last initial dose, followed by annual boosters going forward. Puppies can start the series as early as the label allows, typically alongside other puppy vaccinations.
Each dose typically costs around $50 at a veterinary clinic, meaning the initial two-dose series runs roughly $100 before exam fees. Annual boosters are a single dose at a similar price point. Some clinics bundle it with other non-core vaccines or wellness packages.
It Won’t Interfere With Lyme Testing
One practical concern dog owners have is whether vaccination will cause a false positive on a Lyme disease test. The standard screening tests used in veterinary clinics detect antibodies to a protein called C6, which is produced only during active infection, not by any current vaccine. In studies, vaccinated but uninfected dogs consistently tested negative on C6-based tests. This means your vet can still accurately diagnose a Lyme infection in a vaccinated dog without the results being muddied by vaccine-induced antibodies.