Guinea Pig Respiratory Infection: Signs, Causes, Treatment
Guinea pigs are obligate nasal breathers with a high resting respiratory rate, so any breathing change is significant. Bordetella bronchiseptica and Streptococcus pneumoniae are the most common bacterial culprits and can progress from a mild snuffle to fatal pneumonia within 48 hours. Prompt rabbit-safe antibiotics, oxygen, fluids, and forced feeding for those who stop eating make the difference between recovery and death (Quesenberry & Carpenter, Ferrets, Rabbits, and Rodents, 4th ed., 2021).
Last reviewed: June 2026
Common Causes
Bordetella bronchiseptica is the most frequently isolated bacteria — often carried by rabbits and dogs without signs, who infect a vulnerable guinea pig in the same household. Streptococcus pneumoniae is the next most common pathogen and tends to cause more severe pneumonia. Other contributors include Pasteurella, Mycoplasma, and viral infections. Stress, overcrowding, poor ventilation, dusty bedding, low humidity, and vitamin C deficiency all increase risk. Concurrent dental disease can mimic respiratory signs by causing chronic eye and nasal discharge.
Signs
Nasal discharge is the most obvious sign. Sneezing, eye discharge, clicking or rattling breath sounds, fast respiratory rate (normal is 40 to 100 per minute; faster than 100 is worrying), and labored abdominal breathing follow. Reduced appetite, weight loss, and reluctance to move appear as pneumonia advances. A guinea pig sitting in a corner with the chin tucked is in serious distress.
Diagnosis
Diagnosis is largely clinical based on history and physical exam. Chest x-rays show patchy lung infiltrates in pneumonia. A nasal or tracheal swab and culture guide antibiotic choice. Bloodwork is helpful when systemic illness is suspected. Differential diagnoses include allergic rhinitis (from dusty bedding or hay), dental root infection invading the nasal cavity, and rarely thymoma.
Treatment
Antibiotic choice matters: oral penicillin, amoxicillin, ampicillin, lincomycin, and clindamycin are toxic to guinea pigs and can cause fatal antibiotic-associated enterotoxemia. Trimethoprim-sulfa, enrofloxacin, chloramphenicol, and doxycycline are commonly used for 14 to 21 days, ideally guided by culture. Nebulization with saline and bronchodilators improves comfort. Supportive care includes warmed Critical Care or Oxbow Critical Care syringe feedings every 3 to 4 hours, subcutaneous fluids, and high-vitamin-C support. Pain control, when needed, uses meloxicam at exotic-mammal doses, as described in Carpenter's Exotic Animal Formulary.
Prevention
Keep guinea pigs in a separate room from rabbits and dogs whenever possible, use low-dust hay-based bedding, and maintain ambient temperatures between 65 and 75 degrees Fahrenheit with humidity 30 to 70 percent. Quarantine new arrivals for 30 days. Ensure 30 to 50 mg of vitamin C per day per guinea pig through diet and supplementation. The 2024 AEMV Pet Care Guides, 2024 outline detailed husbandry standards that prevent most respiratory disease.
When to See a Vet
Call your vet today if:
- Any nasal or eye discharge
- Sneezing more than a couple of times in a session
- Fast or labored breathing, especially with abdominal effort
- Reduced appetite or selective eating
- Reluctance to move or sitting hunched in a corner
Go to the ER immediately if:
- Open-mouth breathing or blue gums
- Severe lethargy or unresponsiveness
- Refusal to eat for more than 12 hours plus respiratory signs
- Audible wheezing, clicking, or rattling with each breath
- No fecal pellets for 12 hours plus respiratory signs
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Frequently Asked Questions
What antibiotics are safe for guinea pigs?
Trimethoprim-sulfa, enrofloxacin, doxycycline, and chloramphenicol are commonly safe. Oral penicillin, ampicillin, amoxicillin, clindamycin, and lincomycin are dangerous and can cause fatal enterotoxemia. Always use an exotic-savvy vet — using a leftover prescription from a dog or cat can kill a guinea pig within days.
How much does respiratory infection treatment cost?
Exotic vet exam typically runs $80 to $200, chest x-rays add $150 to $400, and bloodwork plus culture is $150 to $400. Outpatient antibiotic and nebulization treatment courses are $100 to $300. Hospitalization for severe pneumonia is $400 to $1,500. Catching infection early dramatically reduces total cost and improves survival.
Can my guinea pig catch this from my rabbit or dog?
Yes. Bordetella bronchiseptica is commonly carried asymptomatically by rabbits and dogs and is the most common cause of guinea pig respiratory disease. Keep guinea pigs in a separate room when possible, wash hands between species, and never house guinea pigs with rabbits.
How can I tell pneumonia from a stuffy nose from dusty bedding?
Allergic rhinitis from dusty bedding usually only causes sneezing and clear discharge without appetite changes. Pneumonia causes thick or colored discharge, fast breathing, reduced appetite, and lethargy. Any guinea pig who stops eating needs same-day exotic vet attention regardless of the cause.
Will my guinea pig need to be hospitalized?
Severe pneumonia, especially with reduced appetite and labored breathing, often requires hospitalization for oxygen, IV fluids, and assisted feeding for 1 to 5 days. Mild cases may be managed at home with strict syringe feeding and prescribed antibiotics, but daily phone updates to the exotic vet are essential.
Still Not Sure if Your Guinea Pig Needs a Vet?
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