Tick-Borne Diseases in Dogs: What to Watch For and When to Act

Finding a tick does not mean your dog will become ill. But new lethargy, appetite loss or limping after possible tick exposure deserves a veterinary call—not a wait for more obvious signs. Collapse, breathing difficulty or rapidly worsening weakness means emergency care.

Tick-borne diseases in dogs include Lyme disease, anaplasmosis, ehrlichiosis, babesiosis and Rocky Mountain spotted fever. Their symptoms overlap with one another and with unrelated illnesses. You cannot identify the disease from signs alone, and never finding a tick does not rule out exposure: immature ticks can be tiny and easily missed. Michigan State University explains these risks.

Watch, call or go now?

Watch and arrange routine advice: a tick, but your dog is otherwise normal

If your dog is eating, moving and behaving normally, remove the tick promptly and check for others. Record the date, where your dog may have picked it up, and any recent travel. Monitor appetite, energy, walking, drinking and urination.

In most settings, finding a tick on an otherwise well dog is not, by itself, an emergency. Ask your regular vet whether follow-up testing or a prevention review is appropriate, especially after repeated exposure.

Australian paralysis-tick areas are an important exception. If your dog lives in or has visited these areas and you find a tick, remove it promptly, keep your dog quiet and seek veterinary care immediately—even without obvious illness. RSPCA Australia advises urgent care after finding a tick.

Do not treat a few normal days as an all-clear. Cornell reports that anaplasmosis signs may begin one to two weeks after infection, while Lyme signs may take two to five months.

Call today: new illness or unexplained changes

Contact your vet today if your dog develops:

• Unusual tiredness, reduced appetite or reluctance to walk.
• New limping, stiffness or painful-looking joints.
• Vomiting or diarrhea alongside low energy or appetite loss.
• Unexplained bruising or a nosebleed.
• Dark or bloody-looking urine, or a noticeable increase in thirst and urination.

These changes can occur with tick-borne infections, including ehrlichiosis, babesiosis and Lyme-related kidney disease. Tell the clinic about possible exposure even if you never saw a tick. Do not wait for a scheduled screening test if your dog is unwell.

Go now: emergency signs

Seek emergency veterinary care for collapse, difficulty breathing, newly pale or white gums, severe or uncontrolled bleeding, or rapidly worsening weakness—particularly if your dog cannot stand. VCA’s emergency guidance identifies collapse, breathing difficulty, major bleeding and signs of shock as emergencies. Our dog gum-color guide can help you recognize concerning changes without forcing your dog’s mouth open.

Sudden hind-leg weakness or breathing changes after tick exposure can also be tick paralysis. This is caused by a toxin in tick saliva, not an infection. Removing a tick is necessary but is not a substitute for emergency care; illness can continue to worsen after removal, particularly with Australian paralysis ticks. Keep your dog quiet while arranging transport, and do not delay the trip to search for every tick. Merck Veterinary Manual describes tick paralysis.

Which diseases cause which signs?

The distinctions help explain your vet’s concerns, but they are not a home diagnostic checklist:

• Lyme disease: Most exposed dogs do not become sick. Those that do may develop lameness, painful or swollen joints, low energy and reduced appetite. An uncommon but serious kidney complication can cause vomiting, increased thirst and urination, and marked lethargy. Cornell’s Lyme guide
• Anaplasmosis: Some dogs show no illness; others develop fever, reduced appetite, lethargy or lameness. Cornell’s anaplasmosis guide
• Ehrlichiosis: Low energy and appetite loss may occur, while reduced platelets can lead to bruising or bleeding. Infection can become long-term. Merck’s ehrlichiosis guide
• Babesiosis: Parasites infect red blood cells and can cause anemia, weakness, pale gums and dark urine. VCA’s babesiosis guide

Risk depends on where your dog lives and travels, and which ticks occur there. Give your vet the exposure history rather than trying to choose a disease yourself.

Remove an attached tick promptly

For an accessible tick on a cooperative dog:

1. Part the fur and grasp the tick close to the skin with fine-point tweezers.
2. Pull straight upward with slow, steady pressure. Do not twist, jerk or squeeze its body.
3. Wash your hands and clean the tool after removal. Ask your vet about cleaning an irritated bite site.

These steps follow AKC’s dog-specific removal guidance. If you cannot safely reach or remove the tick, contact your vet for help. Do not use heat, petroleum jelly or nail polish to make it detach; CDC advises against these methods.

Testing, treatment and prevention

An antibody test may indicate exposure rather than active disease. For example, a positive anaplasmosis result does not automatically mean antibiotics are needed. Timing matters too: Lyme antibodies may not yet be detectable immediately after a bite. Your vet interprets results alongside symptoms and may recommend blood work, urine testing or follow-up tests. Cornell explains anaplasmosis testing and Lyme testing. Do not start leftover antibiotics or give human pain medicines without veterinary advice.

Use consistent, veterinarian-recommended tick prevention, check your dog after outdoor exposure, and remove attached ticks promptly. Keeping grass short and clearing leaf piles can reduce exposure around the yard. Ask whether Lyme vaccination fits your dog’s location and lifestyle; it does not replace tick control or protect against every tick-borne disease. Cornell’s prevention recommendations support combining vaccination with tick control when appropriate.