The Lyme Disease Vaccine for Dogs: Is It Right for Yours?

What is Lyme disease, and how do dogs get it?

Lyme disease is caused by a bacterium called Borrelia burgdorferi, which is transmitted by the bite of an infected blacklegged tick. The tick has to stay attached for a day or two to pass the bacteria along, which is why tick checks and prevention are so effective.

"Ticks are essentially in our outside environment almost everywhere," Dr. Long said. "They tend to be very present in low foliage on the ground, but a dog can really pick up a tick anywhere."

The ticks that carry it. In the eastern and central United States, the carrier is the blacklegged tick, also called the deer tick. In the West, it is the western blacklegged tick. Both wait on grass, leaf litter, and low brush and latch onto a passing dog. Immature ticks, called nymphs, are about the size of a poppy seed and are responsible for many infections because they are so easy to miss. Ticks are most active in spring, summer, and fall, but adults can feed on any day above freezing.

How infection happens. Once attached, an infected tick generally needs 24 to 48 hours of feeding before the bacteria move from its gut into the dog. Removing ticks within a day of attachment prevents most infections, and preventive products that kill ticks quickly work on the same principle. Lyme disease is not spread from dog to dog or from dogs to people.

Where it is common. Lyme disease is heavily concentrated in the Northeast, the mid-Atlantic, and the upper Midwest, with a smaller pocket along the Pacific coast. It is much less common across most of the states where Modern Animal has clinics, including Texas, Colorado, Arizona, and much of California, though the western blacklegged tick does carry Lyme in parts of coastal and northern California, and the disease has been reported in every state. Because dogs travel, a dog living in Dallas can still be exposed on a summer trip to New England.

What are the symptoms of Lyme disease in dogs?

Most infected dogs never show signs. Those that do typically develop fever, lethargy, and a shifting lameness with swollen, painful joints, usually two to five months after the tick bite. A small number develop a serious kidney condition.

"Lyme disease varies in severity in dogs," Dr. Long said. "Some dogs become infected but never have clinical signs. Other dogs get very serious disease and can have tremendous symptoms from the disease, such as losing protein through the urine and also having arthritis in their joints."

The typical picture. The classic sign is a dog that is suddenly lame on one leg, seems better in a few days, and then goes lame on a different leg. Joints may be warm and swollen, the dog may run a fever, lose its appetite, and act tired, and lymph nodes near the affected joint may enlarge. Because signs appear months after the bite, owners rarely connect the two.

Lyme nephritis. In a small minority of dogs, the immune response to the infection damages the kidneys, causing protein to leak into the urine. This form, called Lyme nephritis, can progress to kidney failure and is often fatal despite treatment. Labrador and golden retrievers appear to be overrepresented. Increased thirst and urination, vomiting, weight loss, and limb swelling are warning signs.

Diagnosis and treatment. Many vets screen for Lyme antibodies with the same annual blood test used for heartworm, so a dog may test positive without ever being sick. A positive test means exposure, not necessarily illness, and your vet may follow up with a quantitative antibody test and a urine protein check before deciding whether to treat. Dogs with signs are treated with a four-week course of doxycycline, and joint pain usually improves within days; kidney involvement needs more aggressive care.

When to be seen. A dog with unexplained lameness, fever, or lethargy, especially one that spends time outdoors or has traveled to a high-risk region, should be checked promptly. Book an appointment if you notice these signs. If you find an attached tick and are unsure what to do, Modern Animal All Access and Essential members can reach our team anytime through 24/7 Virtual Care.

Is the Lyme vaccine recommended for every dog?

No. At Modern Animal, the Lyme vaccine is a lifestyle vaccine, which means your vet recommends it based on your dog's realistic tick exposure rather than giving it to every patient.

"If you and your veterinarian decide that your dog should be vaccinated against Lyme disease," Dr. Long said, the vaccine follows a defined schedule. The decision is a conversation, not a default.

Core versus lifestyle. Core vaccines such as rabies, distemper, parvovirus, and adenovirus are given to every dog because the diseases are widespread, severe, or a risk to people; our guide to core vaccines for dogs covers those, and leptospirosis has joined that list. Lifestyle vaccines, including Lyme, Bordetella, and canine influenza, are recommended when a dog's routine puts it in contact with the disease.

Dogs that should be vaccinated. The strongest case is for dogs that live in or regularly visit high-prevalence regions, and for dogs anywhere that hike, hunt, camp, or spend time in wooded, brushy, or tall-grass areas where blacklegged ticks live. A dog that summers in the Northeast or Midwest, joins you on backpacking trips, or lives in a part of California where the western blacklegged tick carries Lyme is a good candidate.

Dogs that may not need it. A dog whose outdoor time is limited to city sidewalks and a fenced yard in a low-prevalence area may not benefit enough to justify the vaccine, and your vet may reasonably recommend relying on tick prevention alone. That can change with a move or a new travel habit, so tell your vet a month or more before a trip so the initial series can be completed first.

How does the Lyme vaccine work, and what should I expect after it?

The vaccine trains your dog's immune system to produce antibodies against a protein on the surface of the Lyme bacteria. When a tick bites a vaccinated dog, those antibodies enter the tick with its blood meal and neutralize the bacteria inside the tick, before they can move into your dog.

What it covers. Most canine Lyme vaccines target a protein called OspA, which the bacteria display while living in the tick's gut, and some also target OspC, which appears once the bacteria enter the dog. It does not contain live bacteria and cannot cause Lyme disease.

What it does and does not do. The vaccine substantially reduces the risk of infection but does not eliminate it, and it offers no protection against the other diseases blacklegged ticks carry, such as anaplasmosis, or against the diseases spread by other tick species. That is why Dr. Long and our vets pair the vaccine with tick prevention rather than treating it as a substitute. A vaccinated dog that develops lameness or fever still needs a visit.

Common side effects. Most dogs feel fine. Some are a little tender where the vaccine was given, slightly tired, or less hungry for a day. A small, firm lump under the skin at the injection site can appear and usually resolves within a few weeks. Serious reactions are rare.

When to call. Facial swelling, hives, repeated vomiting, difficulty breathing, or collapse within a few hours of any vaccine are emergencies and warrant an immediate call or visit. If your dog has reacted to a vaccine in the past, tell your vet before the appointment so they can plan accordingly.

What does tick prevention have to do with it?

Everything. Ticks are the only way dogs get Lyme disease, so a preventive that kills ticks quickly protects your dog whether or not they are vaccinated, and it also covers the tick-borne diseases the vaccine does not.

Choosing a preventive. Modern tick preventives come as monthly or every-few-months chewables, topical liquids, and long-acting collars. Many are combined with flea control, and some are bundled with heartworm prevention so a single monthly dose covers all three. Your vet can help you pick a product that fits your dog's lifestyle and what they may already be on. For Modern Animal members, Autoship can deliver preventives on schedule so a lapse does not sneak up on you.

Daily habits. After walks in grassy or wooded areas, run your hands over your dog's coat, paying attention to the ears, neck, armpits, groin, and between the toes. Remove any attached tick with fine-tipped tweezers or a tick tool, grasping close to the skin and pulling straight out. Keep your lawn mowed and your dog on trails rather than in brush where you can.

Why both. Prevention products are highly effective but not perfect, and no owner catches every tick. In a high-risk dog, the vaccine is the second layer that catches what prevention misses; in a low-risk dog, prevention alone is often enough.

What does the Lyme vaccine schedule look like?

Two doses to start, three to four weeks apart, then one dose every year. That is the whole schedule, whether your dog is a puppy or an adult receiving the vaccine for the first time.

"We'll give an initial vaccination, and then we'll booster that vaccination in three to four weeks," Dr. Long said. "After that, it's merely a situation where you need to get the vaccination redone on a yearly basis."

Puppies. Puppies in at-risk situations can begin the series as early as 8 to 12 weeks of age, depending on the product, often alongside core vaccine visits. Protection is not in place until a couple of weeks after the second dose, so puppies should stay out of tick habitat until the series is complete.

Adult dogs starting for the first time. An adult dog that has never had the vaccine receives the same two-dose start. If the second dose is missed by more than a few weeks, ask your vet whether the series needs to be restarted.

Timing the booster. Because ticks are most active in spring and summer, many vets schedule the annual booster in late winter or early spring so protection peaks when exposure does. The annual wellness exam is a natural time to handle it, along with the tick-borne disease screening that often runs with the heartworm test.

Keeping records handy. "If your dog does receive the Lyme vaccination, that information will be available on the Modern Animal app, and you can easily download the full record of vaccinations and share it with your groomer, your dog's daycare provider, or even a dog park," Dr. Long said.

What does the Lyme vaccine cost?

Vaccine costs at Modern Animal vary depending on where you live. The Lyme vaccine is typically given as part of a wellness visit, and the overall cost of that visit depends on what else is recommended.

What affects the price. The type of visit is one factor, since a vaccine given during a wellness exam is billed alongside that exam while a vaccine-only visit is structured differently. Your dog's age and health history shape what else your vet recommends at the appointment, and any additional diagnostics, are priced separately. The first-time series requires two visits; after that, it is one dose per year.

For a full breakdown of service and test pricing at Modern Animal, visit modernanimal.com/pricing. Everything is listed transparently so you know what to expect before you come in.

The bottom line. Lyme disease is preventable, and for dogs with real tick exposure, vaccination is a straightforward addition to routine care. It is not for every dog, which is why the conversation with your vet matters: they will weigh where you live, where your dog spends time, and where you travel, and tell you whether the vaccine belongs on the schedule. Either way, consistent tick prevention is the foundation, and the Modern Animal app keeps the records ready whenever a groomer or daycare asks.

If you are not sure whether your dog needs the Lyme vaccine, or you have a trip to tick country coming up, book an appointment and we will walk through it together. For more on vaccines and preventive care, visit the Modern Animal blog.