How is Babesia transmitted to dogs and cats?

Transmission most commonly occurs through the bite of an infected tick; tick prevention is the cornerstone of prevention. If you suspect your pet has been exposed to ticks, consult your veterinarian promptly.

How can I tell if my pet has Babesia infection?

Diagnosis typically requires blood tests and specific tests such as PCR or a blood smear, which are interpreted by a veterinarian who will then arrange appropriate follow-up care.

Does my pet need follow-up testing after treatment?

Yes — your vet will recommend regular blood and biochemistry checks to confirm improvement in anaemia and organ function, and to determine whether extended monitoring is needed.

What preventive measures can I take at home?

Maintain good environmental hygiene and apply regular tick prevention measures; avoid taking pets to areas with a high tick burden, and use effective tick prevention products as recommended by your veterinarian.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Babesiosis in Dogs and Cats: Symptoms, Diagnosis & Care Guide [2025]

Babesiosis is a tick-borne blood parasite disease that causes haemolytic anaemia and requires antiparasitic treatment

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: AVMA, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek emergency care immediately

•Gums or whites of eyes become very pale and the pet is weak
•Persistent severe weakness or prolonged unresponsive lethargy
•Rapid breathing or obvious difficulty breathing

Schedule a clinic visit soon (within 24–72 hours)

•Continued loss of appetite or noticeable pickiness with weight loss
•Recurring fever or body temperature consistently elevated for more than one day
•Noticeably low energy and significantly reduced activity compared to normal

01What symptoms indicate something is wrong?

Dogs and cats infected with Babesia commonly present with general malaise, reduced appetite and activity, or anaemia-related signs; some individuals may also develop fever and jaundice.

Lethargy, noticeably reduced activity, or excessive sleepiness
Decreased appetite or persistent fussiness with food; changes in water intake
Gradual weight loss or visible loss of body condition
Recurring or unexplained fever
Yellowing of the whites of the eyes or skin (jaundice)
Signs of anaemia such as weakness or tiring easily

Seek emergency care immediately if you notice the following symptoms:

⚠️ Pale or significantly whitened gums
⚠️ Severe weakness or prolonged unresponsive lethargy
⚠️ Rapid breathing or signs of respiratory distress

02How can I assess the situation at home? Key observations and emergency warning signs

Recording specific observations at home helps your veterinarian quickly assess the condition and monitor treatment progress.

Note the date and time when symptoms first appeared
Record food intake, water consumption, and changes in elimination daily
Use a home thermometer to measure and log your pet's temperature
Observe and record any changes in stool appearance, urine colour, or frequency
Take short videos of activity levels or abnormal behaviour to show your vet

03How will my vet diagnose this? Common diagnostic tests

At the clinic, your vet will begin with a physical exam and laboratory tests, progressing to imaging or specialist testing as needed to confirm the diagnosis and identify any complications.

Physical examination

includes palpation, mucous membrane (gum) colour assessment, and lymph node check

Complete blood count (CBC) to evaluate for anaemia or inflammation

Blood biochemistry panel to assess liver and kidney function and overall metabolic status

PCR (polymerase chain reaction) blood test or blood smear to confirm the presence of the pathogen

Urinalysis to rule out concurrent or contributing conditions

Ultrasound or imaging to assess organ involvement if indicated

Referral to a specialist hospital capable of PCR testing is recommended for further workup

04What treatment and aftercare will my pet need? Medication, diet, and home care guide

Treatment is determined and prescribed by your veterinarian; owners must complete the full medication course, attend scheduled check-ups, and maintain home parasite prevention to minimise the risk of relapse.

Complete the full course of medication and all follow-up appointments as directed by your vet
Schedule regular blood and biochemistry tests to monitor recovery
Continue monitoring appetite, alertness, and activity levels at home
Strengthen tick prevention measures and environmental hygiene to reduce the risk of re-infection
Provide nutritional support as needed and gradually increase activity as your pet recovers

05What should I prepare before the vet visit? Key information to help your vet diagnose quickly

Prepare a detailed record of when symptoms started and how they progressed

List any changes in appetite, water intake, and stool or urine output

Bring recent temperature readings or videos of abnormal activity or symptoms

Bring a list of all current medications and preventive treatments (dewormers, tick prevention products)

Provide any past test reports or imaging results for the vet's reference

Consider calling ahead to book an appointment and choose a clinic that offers PCR testing

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.

Related Symptoms (You May Also Be Looking For)

Loss of appetite

Elevated temperature

Yellow skin/eyes

Decreased activity

Enlarged lymph nodes

Pale Mucous Membranes

White gums