What is the difference between sepsis and bacteremia?

Sepsis generally refers to a severe systemic inflammatory response to infection, while bacteremia specifically means bacteria have been detected in the bloodstream. Distinguishing between them requires laboratory results and clinical assessment — ask your vet to clarify which applies to your pet.

What tests will the vet run first?

Common initial tests include blood work, blood culture, X-rays, and ultrasound. The aim is to locate the source of infection and assess organ function, and your vet will use the results to plan next steps.

What records can I keep at home to help with diagnosis?

It helps to track your pet's temperature, breathing rate, alertness, and bathroom habits, and to record any changes on video. Bringing a list of current medications also allows the vet to assess the situation faster and arrange appropriate tests.

How long does a pet with sepsis usually need to stay in hospital?

The length of hospitalisation varies depending on each patient's condition and response to treatment, ranging from a few days to several weeks. Your vet will advise based on clinical assessment and culture results.

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

Sepsis & Bacteremia in Dogs and Cats: Symptoms, Diagnosis & Care [2025]

A life-threatening systemic bacterial infection requiring immediate veterinary attention

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: ACVIM, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Obvious and persistent difficulty breathing or labored breathing
•Sudden loss of consciousness and unable to be roused
•Gums or mucous membranes noticeably pale or blue

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

•Persistent fever lasting more than one day without improvement
•Lethargy or noticeably reduced activity level
•Appetite loss lasting more than twenty-four hours without eating

01What symptoms indicate something is seriously wrong?

These are common clinical warning signs of sepsis or bacteremia, indicating that an infection is affecting overall body function. Prompt veterinary assessment is essential.

Lethargy or a noticeable drop in activity level
Persistent or recurring fever, or abnormal body temperature
Rapid breathing or obvious difficulty breathing
Fast or irregular heartbeat, or changes in pulse quality
Changes in mucous membrane colour (e.g. pale or bluish/purple gums)
May also include loss of appetite, vomiting, or diarrhoea

Seek emergency care immediately if you notice the following symptoms:

⚠️ Obvious difficulty breathing or inability to catch breath
⚠️ Sudden loss of consciousness or collapse
⚠️ Gums or mucous membranes appear severely pale or blue-purple
⚠️ Heartbeat is extremely irregular or cannot be detected

02How do I assess the situation at home? Key observations and when to go to emergency

These are key home observation and documentation tips that help your vet quickly understand the situation and determine how urgently your pet needs to be seen.

Record the timing and severity of changes in alertness and activity
Measure and log body temperature daily, including the time and reading
Note breathing rate and whether your pet appears to be working hard to breathe
Track changes in appetite, water intake, and frequency of vomiting
Log urine output and stool consistency
Take photos or videos to help your vet assess the situation remotely
If any warning signs appear, arrange a clinic visit or specialist evaluation promptly

03How does the vet make a diagnosis? Common diagnostic tests

These are the tests commonly performed after admission to confirm the source of infection, assess organ function, and guide treatment decisions.

Complete blood count

evaluates white blood cells, organ function, and electrolytes

Blood culture

checks whether bacteria are present in the bloodstream (requires specialist arrangement)

X-rays

looks for potential sources of infection in the lungs, abdomen, or elsewhere, and checks for complications

Ultrasound

assesses the abdomen or chest for abscesses or fluid accumulation

Cytology or fine-needle aspirate

characterises local inflammation or infection

Cardiac ultrasound and haemodynamic assessment when indicated

PCR or other pathogen testing

arranged at a specialist hospital to identify the causative organism

04What does treatment and aftercare involve? Medications, diet, and home care

Treatment for sepsis and bacteremia must be tailored to test results. Hospitalisation and ongoing monitoring are often necessary.

IV fluids to maintain blood pressure and electrolyte balance
Antibiotics as directed by the vet, adjusted based on culture results
Continuous monitoring of vital signs and repeat blood tests to track response
Hospitalisation or intensive care support when necessary
Regular recheck appointments to review culture results and adjust the treatment plan
Nutritional support and dietary management to aid recovery and maintain strength
Follow-up at a hospital with blood culture capability and advanced imaging is recommended

05What should I prepare before the vet visit? Key information to help pinpoint the cause

Write down when symptoms first appeared, how they have changed, and any response to medications

List all current prescription medications and supplements, including when they were started

Bring your temperature log, bathroom diary, and any observation videos

Record a video of your pet's breathing, activity level, or any vomiting episodes

Bring any previous test reports or imaging results to the appointment

Mention when booking that blood culture or specialist imaging may be needed

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.