Does fever in pets always mean infection?

Fever is commonly associated with infection, but it can also be caused by immune disorders, inflammation, or other conditions. If your pet's temperature is abnormal and persistent, a vet examination and blood tests are recommended to identify the cause.

What records or samples should I bring to a follow-up appointment?

Bring temperature records, notes on appetite and bowel movements, photos or videos of symptoms, and any previous blood test or imaging reports for the vet's reference.

When will PCR or bacterial culture testing be arranged?

If a specific pathogen is suspected, or if the vet needs to identify the causative bacteria and test for antibiotic sensitivity, PCR or bacterial culture testing will be arranged based on your pet's symptoms and initial examination results.

Is follow-up or completing the full course of treatment necessary even after symptoms improve?

Yes. Even when symptoms improve, most infections require completing the full course of treatment and attending follow-up appointments for blood or clinical monitoring to prevent relapse or antibiotic resistance.

How much do the tests and treatment for this condition usually cost?

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

Disease Guide

Lyme Disease in Dogs & Cats: Symptoms, Diagnosis & Care Guide [2025]

Lyme disease is transmitted by ticks and causes fever, lameness, and joint swelling. Prompt antibiotic treatment is highly effective, and tick prevention significantly reduces the risk of infection.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: WSAVA, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•High fever persisting for more than 24 hours without improvement
•Sudden inability to stand with generalized weakness and collapse
•Persistent vomiting or diarrhea causing obvious dehydration

Schedule a Clinic Visit Soon (within 24–72 hours)

•Noticeably decreased appetite with multiple meals skipped over consecutive days
•Fever lasting more than one day but pet can still move briefly
•Lethargy and significantly reduced activity level

01What Symptoms Indicate a Problem?

These are common signs of infection or systemic illness that owners can observe in their pet's daily behaviour and physical condition.

Noticeable decrease in appetite or complete refusal to eat
Persistent or intermittent fever and abnormal body temperature
Unsteady gait, changes in walking pattern, or lameness
Pain response or flinching when touched
Lethargy and significantly reduced activity levels

Seek emergency care immediately if you notice the following symptoms:

⚠️ Persistent high fever that does not come down within a short time
⚠️ Sudden inability to walk or generalised weakness
⚠️ Severe vomiting or diarrhoea with signs of dehydration

02How to Assess Abnormal Signs at Home: Observation Tips and When to Go to the Emergency Vet

Recording key changes at home before your vet visit helps the vet make a quick assessment and arrange appropriate diagnostics.

Track appetite and food intake changes daily
Take your pet's temperature regularly and note the time and method used
Film short videos of activity, walking, or symptoms for the vet's reference
Record changes in urination and defecation frequency and stool consistency
Note the onset time, first symptoms observed, and how they have progressed

03How Will the Vet Diagnose the Problem? Common Diagnostic Tests

Based on your pet's clinical presentation, the vet will arrange a systematic examination and imaging assessment.

Basic physical examination and palpation to assess pain and vital signs

X-ray

to evaluate changes in the chest, abdominal organs, or bones

Ultrasound

real-time assessment of abdominal or organ abnormalities

Cytology

sample collection to examine cell morphology and signs of inflammation

Laboratory tests

blood biochemistry, complete blood count, bacterial culture, or PCR testing

04How Is the Condition Treated and Managed? Medication, Diet, and Home Care Guide

Treatment is determined by diagnostic results. Following the vet's instructions for medication and follow-up after discharge is essential.

Antibiotic or targeted supportive treatment based on diagnostic findings
Hospitalisation for monitoring and intravenous fluid support if required
Regular follow-up visits and blood tests to monitor treatment response as directed
Complete the full course of treatment as recommended, even after symptoms improve
If the condition does not improve, a referral to a specialist or advanced imaging may be arranged

05What Should You Prepare Before the Vet Visit? Key Information to Help Your Vet Quickly Identify the Cause

Record the onset time, order in which symptoms appeared, and how they have changed

Note any recent changes in appetite, water intake, and bowel movements

Bring a stool or urine sample to the clinic if available

Prepare a list of current medications, vaccination history, and known allergies for the vet

Take photos or short videos of symptoms and changes in your pet's condition to help explain the situation

Call ahead to book an appointment and ask about any tests that can be arranged in advance

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.