What should I do if my dog or cat has been exposed to petrol or motor oil?

If the coat or skin is contaminated, gently blot away surface oil with dry paper towels — avoid rubbing. If vomiting, coughing, or breathing changes occur, go to the vet immediately and tell them the source and time of exposure.

Do symptoms of petroleum hydrocarbon toxicity appear straight away?

Symptoms can appear within minutes to several hours depending on the route and amount of exposure. If you notice unusual behaviour or persistent vomiting, seek veterinary evaluation as soon as possible.

What first-aid steps can I take at home to reduce harm?

If it is safe to do so, move your pet away from the source of contamination and prevent them from licking or re-contacting it. Collect any vomit or suspected material in a sealed bag to bring to the vet, and call ahead to describe the exposure.

What is the prognosis for petroleum hydrocarbon toxicity, and how long is follow-up needed?

Prognosis depends on the amount of exposure and whether inhalation occurred. Mildly affected pets often improve within a few days. Those with respiratory complications from inhalation may require longer monitoring and follow-up imaging — follow your vet's recommended schedule.

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

Petroleum Hydrocarbon Toxicity in Pets: Respiratory & GI Symptoms, Diagnosis & Supportive Care [2025]

Toxicity from ingestion of petroleum products requiring supportive therapy

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: APCC, AVMA

When to See a Vet

Seek immediate veterinary care (emergency)

•Obvious difficulty breathing with persistent rapid breathing
•Oily discharge or heavy foam from the mouth or nose
•Lethargy, dull responsiveness, or even coma

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

•Persistent, repeated vomiting several times or vomit that looks oily
•Ongoing soft stool or diarrhea along with reduced appetite
•Frequent coughing or choking with obvious changes in breathing

01What symptoms indicate something is wrong?

After exposure to petroleum hydrocarbons, dogs and cats commonly show gastrointestinal and respiratory signs, as well as changes in energy levels. Severity depends on the route of exposure (ingestion, skin contact, or inhalation) and the amount involved.

Repeated vomiting or oily/greasy vomit
Diarrhoea or persistent loose stools with reduced appetite
Abnormal body temperature or fever
Frequent coughing, gagging, or increased throat-clearing
Rapid breathing, wheezing, or shallow breaths
Lethargy, reduced activity, or unsteady gait

Seek emergency care immediately if you notice the following symptoms:

⚠️ Difficulty breathing or rapid, laboured breathing
⚠️ Oily discharge or excessive foam from the mouth or nose
⚠️ Severe lethargy or loss of consciousness

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

Before visiting the clinic, note and record details that will help your vet make an accurate assessment — including when symptoms started and how they have progressed. Preserve any relevant physical evidence.

Note the number of vomiting episodes, their appearance (e.g. oily consistency), and when they occurred
Record daily stool frequency and any changes in consistency
Measure and record body temperature daily if it can be done safely
Track the frequency of coughing and any changes in breathing pattern
Monitor energy level, activity, and food intake
Film symptom episodes with your phone and timestamp the footage to share with your vet
Seek emergency care immediately if breathing worsens or foam appears at the mouth or nose

03How will the vet diagnose this? Common diagnostic tests

Your vet will begin with a physical examination and combine it with blood tests and imaging to evaluate the extent of aspiration injury and organ involvement, then plan appropriate supportive treatment and monitoring.

Physical examination

assessment of mouth, nose, chest auscultation, and mucous membranes

Complete blood count (CBC)

to evaluate for infection or inflammatory response

Biochemistry panel

to assess liver, kidney, and metabolic function

Chest X-ray

to check for aspiration pneumonia or pulmonary changes

Advanced imaging (CT) or endoscopy if clinically indicated

Pulse oximetry and vital sign monitoring

04What treatment and aftercare are needed? Medications, diet, and home care guide

Management centres on supportive care, with treatment of respiratory or infectious complications as needed. Chest imaging and blood tests are scheduled to monitor recovery progress.

Supportive care: fluid therapy and stabilisation of vital signs
Medications or supplemental oxygen as indicated by test results
Dietary adjustments and nursing care for gastrointestinal symptoms
Oxygen therapy or hospitalisation depending on respiratory status
Follow-up chest imaging and blood work to track recovery
Specialist referral or extended hospitalisation if required

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

Note the time and circumstances of first exposure, the source, and the route of contact

List recent food, toys, or items your pet may have come into contact with

Bring a list of current medications and supplements

If possible, bring a sealed sample of vomit or faeces

Prepare a timestamped video of the symptoms to show your vet

Call ahead to confirm the clinic can perform chest X-rays and blood tests before your visit

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.