Dr. Tiffany Delacruz, DVM • Chief Executive Officer, RexVet • 2026-06-06 • 10 min read
Tick Prevention and Lyme Disease in Dogs and Cats: 2026 Vet Guide
Tick exposure is at peak season across the Northeast and Mid-Atlantic. Here is what every dog and cat owner needs to know: the three ticks that matter, how to do a proper tick check, what prevention actually works, and the early Lyme symptoms most owners miss.
Medically reviewed by Dr. Tiffany Delacruz, DVM
Tick season used to be a clear May-to-September event. It is not anymore. Warmer winters across most of the United States mean ticks remain active any time the temperature is above roughly 40°F, including in much of Florida year-round. For pet families in Virginia, New York, and Florida — RexVet's three licensed states — this guide covers the prevention strategy a licensed veterinarian would recommend and the early signs of tick-borne disease that owners most commonly miss.
The three ticks that matter for pets
Hundreds of tick species exist, but three account for nearly all of the pet disease in the U.S.
Black-legged tick (Ixodes scapularis / 'deer tick')
This is the species that transmits Lyme disease, Anaplasmosis, and Babesiosis. It is endemic in the Northeast, Upper Midwest, and much of the Mid-Atlantic. Adults are about the size of a sesame seed; nymphs (which transmit most disease) are about the size of a poppy seed and extremely easy to miss in a coat.
American dog tick (Dermacentor variabilis)
Transmits Rocky Mountain Spotted Fever and tularemia. Found across most of the eastern U.S. and parts of the West Coast. Larger and easier to spot than the deer tick.
Lone star tick (Amblyomma americanum)
Identified by a single white dot on the female's back. Transmits Ehrlichiosis and, in people, the alpha-gal allergy (red meat allergy). Range has expanded sharply northward over the past decade.
Tick prevention — what actually works
Modern prescription tick prevention is dramatically more effective than older over-the-counter options. Three categories work; one does not.
Oral isoxazolines (Bravecto, NexGard, Simparica, Credelio)
Oral chewables that kill ticks within hours of attachment, before disease transmission can occur. Spectrum varies by product (some include heartworm and intestinal parasite coverage). Generally considered first-line for dogs that swim or get bathed frequently, since they cannot wash off. Cat-specific isoxazoline products (Credelio Cat, Bravecto Plus for Cats) became widely available in recent years and changed cat tick prevention substantially.
Topical spot-ons (prescription)
Modern prescription topicals (e.g., Revolution Plus for cats, Frontline Plus, Vectra 3D) remain effective when applied as directed. They are washed away or reduced by frequent bathing or swimming, so timing matters.
Tick collars (prescription only — Seresto)
The veterinary-prescribed long-acting collar works for 8 months. Critical caveat: only use a collar that fits properly and follow the safety guidance from your vet. Cheap over-the-counter 'tick collars' from general retailers are not the same product and do not work the same way.
What does not work
Garlic supplements, essential oils, ultrasonic devices, and most 'natural' tick repellents have no clinical evidence of effectiveness. Some essential oils are actively toxic to cats. If a product is not FDA- or EPA-registered for tick prevention, treat it as unproven.
How to do a daily tick check
Daily checks during peak season are the single most underused prevention tool. A tick generally needs to be attached for 24-48 hours to transmit Lyme — finding and removing it within 24 hours prevents most cases.
Where ticks attach
Run your hands slowly over your dog or cat, feeling for any small bump. Focus on the high-yield areas: inside the ears, around the eyelids, under the collar, between the toes, under the front legs (armpits), and around the tail base and groin.
How to remove a tick
Use fine-tipped tweezers or a tick removal tool. Grasp the tick as close to the skin as possible. Pull straight up with steady, even pressure — do not twist or jerk. Avoid the old folk remedies (lit matches, nail polish, petroleum jelly): they can make the tick regurgitate into the wound, increasing disease transmission risk. After removal, clean the bite area with mild soap and water, save the tick in a sealed bag or jar in case identification helps later, and monitor your pet for 30 days for symptoms.
Early Lyme disease symptoms in dogs
Most pet owners are looking for the bullseye rash they have seen in human Lyme infographics. In dogs, that rash is rare. The clinical presentation is usually different and easier to miss.
- Shifting-leg lameness — the dog appears to limp on one leg one day, a different leg the next
- Lethargy or reduced playfulness
- Low-grade fever
- Reduced appetite
- Swollen lymph nodes
- In severe cases: kidney involvement (Lyme nephritis), which can be life-threatening
What about cats?
Cats can pick up ticks but rarely develop clinical Lyme disease. The bigger feline concerns are Cytauxzoonosis (transmitted by the lone star tick — very high mortality in cats) and tick-borne anemia. Outdoor and indoor-outdoor cats need year-round tick prevention with a cat-labeled product. Never apply a dog-labeled product to a cat — many contain permethrin, which is acutely toxic to cats.
When to call a vet
A telehealth video visit is an appropriate first step for tick exposure, suspected early Lyme symptoms, or guidance on prevention selection. RexVet's licensed veterinarians prescribe tick prevention in Florida, New York, and Virginia and can discuss whether testing is warranted given your pet's recent exposure history. For acute illness (collapse, severe lameness, neurological signs), go to an in-person clinic.
Step-by-step
How to Remove a Tick from a Dog or Cat — Vet Method
Step-by-step tick removal that minimizes disease transmission risk, from a licensed veterinarian.
Use fine-tipped tweezers or a tick removal tool
Avoid blunt tweezers — they can squeeze the tick's body and force pathogens into the wound. A dedicated tick removal tool works even better.
Grasp the tick as close to the skin as possible
Aim for the head/mouthparts, not the body. Squeezing the abdomen can cause the tick to regurgitate into the bite.
Pull straight up with steady, even pressure
Do not twist, jerk, or rock. Steady, slow upward pressure brings the whole tick out, mouthparts included.
Avoid folk remedies
Do not use lit matches, nail polish, alcohol, or petroleum jelly. These can stress the tick and increase disease transmission risk.
Clean the bite and save the tick
Wash the bite area with mild soap and water. Save the tick in a sealed bag or jar in case species identification becomes useful later.
Monitor for 30 days
Watch for shifting-leg lameness, lethargy, reduced appetite, or fever. Contact a vet if any develop.
Emergency signals
When to contact a veterinarian
- Shifting-leg lameness or unexplained limping
- Lethargy, reduced appetite, or low-grade fever after recent outdoor activity
- A tick attached for more than 24 hours
- Reaction at the bite site that worsens over several days
- Any suspected tick-borne illness symptoms in a cat
Frequently asked questions
How long does a tick need to be attached to transmit Lyme disease?
Most research suggests a black-legged tick needs to be attached for 24-48 hours to transmit Lyme disease. That is why daily tick checks during peak season prevent the majority of infections — even if a tick attaches, removing it within 24 hours dramatically reduces transmission risk.
Do I need year-round tick prevention in Florida?
Yes. Ticks remain active anywhere temperatures stay above roughly 40°F, and much of Florida is above that threshold year-round. Most veterinarians in the state recommend year-round prevention. Virginia and the New York City metro area increasingly do the same as winters have warmed.
Can I use my dog's tick prevention on my cat?
Absolutely not. Many dog-labeled tick products contain permethrin, which is acutely toxic — often fatal — to cats. Always use a product specifically labeled for cats. If you have a multi-pet household, keep the products clearly separated and wait the labeled time (usually 24 hours) before letting cats contact a treated dog.
Should I test my dog for Lyme disease after every tick bite?
Not routinely. Lyme antibody tests are most informative when symptoms develop or 4-6 weeks after a known exposure (antibodies take time to rise). Most veterinarians recommend testing in the context of clinical signs, not after every individual tick. Annual heartworm + tick-borne disease screens (commonly the 4Dx test) are part of standard care in endemic regions.
What does the bullseye rash look like on a dog?
It usually doesn't appear. The erythema migrans rash that defines early Lyme in humans is rare in dogs and cats — coats hide it, and the clinical presentation in pets is more typically lethargy, fever, and shifting-leg lameness. Do not wait for a rash to take suspected tick-borne illness seriously.
Are 'natural' tick repellents safe and effective?
Most are not effective, and some are unsafe. Essential oils marketed as tick repellents have minimal clinical evidence behind them, and several (tea tree, pennyroyal, citrus oils) are toxic to cats. Stick to FDA- or EPA-registered, veterinarian-recommended products.