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Signs of tick disease in pets
Signs rarely appear straight away. They can start days or weeks after the bite.
One of the harder things about tick-borne illness in pets is the delay. Unlike a wasp sting or an allergic reaction, which show up within minutes, most tick-borne infections take days to weeks to produce any visible sign. That gap is exactly why it helps to know roughly when and where a tick was found, even if your pet seems completely fine at the time.
Watch for
- Limping that moves between legs: a classic sign of Lyme disease in dogs, sometimes called “shifting leg lameness”
- Unusual tiredness: sleeping more, less interest in walks or play
- Loss of appetite
- Fever: warm ears, shivering, lethargy
- Swollen joints or glands
- Pale gums: can point to anaemia
- Bruising or nosebleeds: worth mentioning to a vet even if they seem minor
Two or more of these after a known tick bite is a reason to call your vet. Do not wait to see if things improve on their own.
A different, faster-moving pattern to know
The signs above describe the bacterial tick-borne illnesses common in North America and parts of Europe, which typically develop gradually. In Australia, the picture is different and the timeline is much shorter: see the regional note below, since mistaking one pattern for the other could delay urgent care.
United States & Canada, UK & Europe
Watch for the signs above over the days and weeks after a bite. These illnesses generally develop gradually, and most are treatable with a course of antibiotics once identified, especially when caught early.
Australia
Progressive weakness is the sign to take seriously: starting in the back legs and potentially worsening over hours to affect the whole body, breathing, or swallowing. This is caused by paralysis tick toxin rather than a bacterial infection, develops much faster than the illnesses above, and is a genuine emergency. A wobbly gait, a change in vocal sound, or any difficulty breathing after time outdoors needs a vet the same day, not a wait-and-see approach.
What your vet needs to know
- Roughly when the tick was found and, if possible, when it was removed
- Where you had been walking or spending time outdoors
- How long the tick was attached, if you know
- The tick itself, if you kept it, or a photo of it
- Any change in behaviour since, even something as small as sleeping more than usual
Keeping the tick, or a clear photo of it, can help your vet judge which illnesses are plausible for your area and how urgently to act. TickSentry’s tick wiki can help you narrow down which species you are looking at, though only a vet and, where needed, blood tests can confirm whether an infection is actually present.
Blood tests and treatment
Blood tests can confirm most tick-borne bacterial illnesses, and treatment is usually a course of antibiotics, started as soon as a diagnosis is made. Paralysis tick toxin works differently: it is not an infection, so antibiotics do not treat it, and management instead focuses on removing the tick and supporting the pet through the acute illness, sometimes with antitoxin, under close veterinary care. This is another reason the regional picture matters: what “get it checked” leads to depends on which condition your vet suspects.
It is worth checking in with your vet even when signs are mild or vague. Lethargy and a reduced appetite can have many causes, and a vet who knows there was a recent tick bite can rule tick-borne illness in or out far more quickly than one working without that piece of the history.
See also: are ticks dangerous to pets and where ticks hide on pets.