Guinea Pig Pyometra: Uterine Infection Signs and Emergency Care

Pyometra is a life-threatening uterine infection affecting intact female guinea pigs, particularly those over 2 years old. The uterus fills with pus, causing lethargy, vaginal discharge, and abdominal distension. Emergency spay is the standard treatment; medical management alone is rarely sufficient and buys little time.

Last reviewed: June 2026

What Is Pyometra in Guinea Pigs?

Pyometra — literally "pus in the uterus" — is a serious bacterial infection of the uterus that occurs in intact female animals. In guinea pigs (sows), it is most common in middle-aged to older females (over 2 years) who have never been pregnant or have had multiple pregnancies, and in females with a history of cystic ovaries. The infection can be:

• Open pyometra: The cervix is open, allowing pus to drain vaginally — provides a warning sign but does not reduce urgency
• Closed pyometra: The cervix is closed, pus accumulates under pressure — more dangerous, faster progression, higher risk of uterine rupture and sepsis

As described in Quesenberry & Carpenter's Ferrets, Rabbits & Rodents, guinea pig pyometra often develops secondary to cystic ovarian disease — ovarian cysts cause hormonal imbalances that make the uterus susceptible to infection. The two conditions frequently co-occur.

Signs of Pyometra in Guinea Pigs

• Vaginal discharge — creamy white, yellow, green, or blood-tinged pus from the vulva
• Enlarged or distended abdomen — the infected uterus can become very large
• Lethargy — often profound; the guinea pig may stop all normal activity
• Reduced appetite or complete anorexia
• Frequent urination posturing — the guinea pig positions to urinate often but may produce little urine (the distended uterus compresses the bladder)
• Hunched posture and pain signs — tooth grinding, muscle tension
• Rough coat and general unthriftiness

Closed pyometra is particularly dangerous because the absence of visible discharge delays owner recognition. A distended, firm abdomen in a lethargic female guinea pig is a pyometra emergency until proven otherwise.

Treatment

Surgical spay (ovariohysterectomy) is the only reliable treatment. The infected uterus and ovaries are removed. Without surgery, the uterus may rupture, causing bacterial peritonitis — rapidly fatal. As noted in the Quesenberry & Carpenter textbook, spay surgery in an ill guinea pig carries significant anesthetic risk, but delaying surgery to "stabilize" a guinea pig with closed pyometra often allows the condition to deteriorate further.

Pre-surgical stabilization (typically a few hours, not days):

• IV or intraosseous fluids
• Antibiotics (typically enrofloxacin or trimethoprim-sulfa)
• Pain management (meloxicam)
• Correction of blood glucose and electrolyte abnormalities

Hormonal therapy (GnRH agonists, HCG injections) may help resolve co-occurring cystic ovaries and slightly reduce inflammation but does not treat established pyometra — surgery is still required.

According to the AEMV Pet Care Guides, 2024, spaying female guinea pigs between 3–6 months of age entirely prevents pyometra, ovarian cysts, and uterine adenocarcinoma — the three most common reproductive conditions in older sows.

When to See a Vet

Call your vet today if:

• Your female guinea pig has any vaginal discharge — even a small amount
• Your female guinea pig's belly looks enlarged or feels firm compared to normal
• Your guinea pig is lethargic, not eating, or sitting hunched and still
• You notice frequent urination posturing without producing normal urine

Go to the ER immediately if:

• Your guinea pig has not eaten for more than 8–12 hours
• The abdomen is very large, tight, or your guinea pig cries out when you touch the belly
• Your guinea pig is cold to the touch, weak, or unresponsive
• Bloody or foul-smelling discharge combined with collapse

Frequently Asked Questions

How much does treating pyometra in guinea pigs cost? An exotic vet visit and initial diagnostics (bloodwork, ultrasound) run $200–450. Emergency spay surgery for a guinea pig ranges from $600–1,800 at an exotic animal hospital due to the small patient size, specialist skills required, and anesthesia complexity. Hospitalization post-surgery adds $200–500 per day. Total treatment cost is commonly $1,000–2,500.

Can pyometra in guinea pigs be treated with antibiotics alone? No — antibiotics alone cannot clear a pyometra. They may temporarily reduce the severity of infection but do not remove the infected uterus. Without surgery, pyometra is fatal. Antibiotics are used as a bridge to surgery, not as a standalone treatment.

How can I prevent pyometra in my guinea pig? Spaying your female guinea pig between 3–6 months of age is the most reliable prevention. After 6 months, the risk of anesthetic complications from calcification of the pubic symphysis (needed for normal birth) begins to increase. If your guinea pig is older and intact, have her examined annually for early signs of ovarian cysts or uterine changes.

What does guinea pig pyometra discharge look like? Discharge ranges from thick white or creamy pus to greenish or blood-tinged fluid. It typically has a foul odor. Some owners mistake it for normal perineal secretions, which is why any novel discharge in an intact female warrants same-day vet evaluation.

Can a guinea pig survive pyometra surgery? Yes — with an experienced exotic surgeon and prompt treatment before sepsis develops, most guinea pigs survive spay surgery for pyometra. The risks are higher in very ill or debilitated animals, which is why early intervention dramatically improves outcomes.

Still Not Sure if Your Guinea Pig Needs a Vet?

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