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Are ticks dangerous to pets?
Ticks feed on blood, and while they feed they can pass bacteria into your pet.
Most tick bites on a pet cause nothing more than a small local reaction: a bit of redness or swelling where the mouthparts were attached. The bigger risk is not the bite itself but what the tick can pass into the bloodstream while it feeds, and which diseases matter varies a great deal depending on where in the world your pet lives.
What a bite can cause
| Illness | Signs |
|---|---|
| Lyme disease | Limping, fever, swollen joints |
| Ehrlichiosis | Fever, bruising, nosebleeds |
| Anaplasmosis | Fever, lethargy, joint pain |
| Babesiosis | Anaemia, weakness, pale gums |
These are the illnesses most commonly discussed in North American and European veterinary guidance, and they do not all occur everywhere. Which diseases are actually relevant to your pet depends heavily on your region, so read the regional notes below rather than assuming every illness on this list applies to you.
Beyond disease
- Skin infection: the bite site can become inflamed and infected, particularly if a pet scratches or chews at it.
- Blood loss: a single tick takes very little blood, but a heavy infestation, especially on a small or young pet, can leave it anaemic.
- Paralysis from toxin: certain tick species produce a toxin in their saliva that can cause progressive weakness in a pet, separate from any bacterial infection. How serious this is, and how likely it is where you live, differs sharply by region, so see below.
In Australia, progressive weakness after a tick bite is a genuine veterinary emergency and needs same-day attention. In the US and Europe, most tick-borne illness is treatable when it is caught early, and speed matters more than panic.
Why the disease picture differs by country
United States & Canada
Lyme disease, ehrlichiosis, and anaplasmosis are the tick-borne illnesses vets watch for most, particularly in dogs that spend time in wooded or grassy areas. These are bacterial infections that take time to develop after a bite and are generally treatable, especially when caught early.
Australia
The paralysis tick is Australia's principal veterinary concern, not Lyme disease: locally-acquired Lyme disease is not officially recognised in Australia. A paralysis tick bite causes progressive weakness that can worsen over hours, affecting a pet's legs, then its ability to swallow or breathe. This is a genuine emergency: a pet showing wobbliness, a change in bark or meow, or difficulty breathing after being outdoors in a paralysis-tick area needs a vet immediately, not a wait-and-see approach.
UK & Europe
Lyme disease is the main tick-borne concern for dogs, though it is less commonly diagnosed in pets than in the US. Babesiosis also occurs in parts of continental Europe. Ask a local vet which illnesses are actually present in your area, since risk varies considerably even within Europe.
What to do if you are worried
A tick you find and remove promptly is far less likely to cause a problem than one left attached for days. If your pet develops any of the signs above, or simply seems “off” in the days or weeks after a bite, contact your vet and mention the bite. See signs of tick disease in pets for the full list of what to watch for and what to tell your vet. TickSentry’s tick wiki can help you recognise which species is locally relevant, though it cannot tell you whether a specific bite has caused an infection; only a vet can do that.