Pig Coughing and Not Eating: Common Causes and Emergency Warning Signs

Coughing and poor appetite in pigs often point to respiratory disease, and pneumonia is high on the list. In miniature pet pigs, Merck notes that common pneumonia causes include Mycoplasma hyopneumoniae and secondary bacterial infections such as Pasteurella multocida. Clinical signs can include coughing, fever, lethargy, breathing difficulty, and in severe cases sudden death. Swine influenza is another important cause, especially in pigs exposed to fairs, exhibitions, or other pigs.

A dry, persistent cough can fit mycoplasmal pneumonia. Merck describes this disease as commonly causing a nonproductive cough, reduced growth, and occasional flares of more obvious respiratory distress. A pig that also stops eating may have a more active infection, fever, pain with breathing, or a secondary bacterial pneumonia on top of the original problem.

Some pigs become sick from more severe bacterial lung infections, including pleuropneumonia caused by Actinobacillus pleuropneumoniae. In pet pigs, signs may range from coughing, fever, and lethargy to sudden death, and pigs that recover can have permanent lung damage. Aspiration pneumonia is another possibility if food, liquid, or medication was inhaled into the lungs. Merck notes that aspiration pneumonia can cause cough, fever, nasal discharge, dehydration, and anorexia.

Not every case is infectious. Smoke, dusty bedding, poor ventilation, or airway irritation can trigger coughing and reduce appetite, especially if the pig already has lung disease. The AVMA warns that wildfire smoke and poor air quality can cause coughing, increased breathing effort, weakness, and reduced appetite in animals. Because several serious problems can look similar at home, your vet usually needs to sort out the cause.

See your vet immediately if your pig is coughing and not eating for more than a few hours, or sooner if breathing looks abnormal. Red-flag signs include open-mouth breathing, belly effort, flared nostrils, blue or gray gums, collapse, severe weakness, repeated vomiting, thick nasal discharge, or a rectal temperature outside your vet's advised normal range for your pig. Merck notes that potbellied pigs with pneumonia can show coughing, fever, lethargy, and difficulty breathing, and that pneumonia is serious because pigs have relatively small lung capacity.

A same-day visit is also wise if your pig has been around other pigs recently, was at a fair or petting zoo, may have inhaled food or liquid, or has stopped drinking. Respiratory infections can spread, and dehydration can make recovery harder. Young piglets, seniors, and pigs with obesity or prior lung disease deserve a lower threshold for urgent care.

Home monitoring may be reasonable only for a brief, mild cough in an otherwise bright pig that is still eating, drinking, and breathing normally. Even then, monitor closely for appetite drop, fever, lethargy, or worsening cough. Merck's general guidance lists continuous coughing as a reason to contact a veterinarian, and with pigs, appetite loss raises the urgency further.

If air quality is poor, move your pig indoors or to the cleanest, best-ventilated area you can provide and call your vet for guidance. The AVMA specifically advises contacting your veterinarian if smoke exposure is followed by coughing, difficulty breathing, fatigue, or reduced appetite.

Your vet will start with a hands-on exam and history. Expect questions about when the cough started, whether it is dry or wet, exposure to other pigs, recent transport or boarding, appetite and water intake, possible choking episodes, and any smoke or dust exposure. They will usually assess breathing rate and effort, hydration, temperature, gum color, and lung sounds.

Depending on how stable your pig is, diagnostics may include a rectal temperature, bloodwork, chest radiographs, ultrasound, pulse oximetry if available, and respiratory sampling such as nasal or deeper airway testing. Merck notes that mycoplasmal pneumonia may be confirmed with PCR testing, while aspiration or severe bacterial pneumonia may be suspected from history, fever, and imaging findings.

Treatment depends on the likely cause and severity. Your vet may recommend oxygen support, injectable or oral fluids, anti-inflammatory medication, nebulization, antimicrobials when bacterial infection is suspected, and nutritional support if your pig is not eating. If aspiration, pleuropneumonia, or severe influenza-like disease is suspected, hospitalization may be the safest option.

Your vet may also discuss biosecurity and isolation if an infectious cause is possible. That matters if you have other pigs at home or if your pig recently visited events where pigs mixed. Follow-up is often important because some pigs improve slowly, and others can relapse or be left with chronic lung changes after severe pneumonia.

Home care should support your pig after speaking with your vet, not replace veterinary care when coughing and appetite loss happen together. Keep your pig in a warm, dry, low-stress area with good ventilation. Reduce dust from bedding and feed, and avoid smoke exposure. If wildfire smoke or poor air quality is present, the AVMA recommends keeping animals indoors as much as possible and watching for coughing, breathing difficulty, weakness, and reduced appetite.

Offer fresh water often and keep favorite familiar foods available unless your vet advises otherwise. Do not force-feed a pig that is struggling to breathe, coughing hard, or acting weak, because aspiration can make things worse. Track how much your pig drinks and eats, and note whether the cough is dry, wet, more frequent with movement, or paired with nasal discharge.

Give only medications that your vet specifically approves for your pig. Many drugs used in other species are not safe or appropriate without veterinary guidance, and food-animal regulations may also matter depending on the pig's status. Follow dosing instructions exactly and finish prescribed courses unless your vet changes the plan.

Recheck promptly if your pig is not improving within 24 hours, stops drinking, develops fever, breathes faster, or seems more tired. Even pigs that recover from pneumonia can have lingering lung changes, so follow-up with your vet matters.