Pyometra: A Life-Threatening Uterine Infection in Dogs
——
Pyometra is a bacterial infection of the uterus that occurs in unspayed female dogs, typically 2-8 weeks after a heat cycle. It is one of the most common and life-threatening reproductive emergencies in veterinary medicine. Without prompt surgical treatment, pyometra is fatal. The condition affects up to 25% of intact female dogs before age 10. Understanding the signs and seeking immediate veterinary care can save your dog's life. Source: Clinician's Brief, 2025.
- Pyometra affects up to 25% of unspayed female dogs before age 10
- It typically occurs 2-8 weeks after a heat cycle
- Signs include: increased thirst/urination, vaginal discharge, lethargy, vomiting, and abdominal swelling
- Emergency spay surgery (ovariohysterectomy) is the standard treatment — antibiotics alone are insufficient
- Without treatment, pyometra is fatal due to sepsis and organ failure
- Spaying your female dog completely prevents pyometra
What Causes Pyometra
After a heat cycle, the uterus is primed for pregnancy. If pregnancy doesn't occur, the uterine lining thickens under hormonal influence, creating an ideal environment for bacterial growth. Bacteria from the vagina ascend into the uterus, causing infection. The cervix may be open (open pyometra — visible discharge) or closed (closed pyometra — no visible discharge but more dangerous because pus accumulates inside).
Recognizing the Signs
Open pyometra: foul-smelling vaginal discharge (pus), excessive licking of the genital area, lethargy, decreased appetite. Closed pyometra: more dangerous — increased thirst and urination, lethargy, vomiting, abdominal swelling, rapid deterioration. Both types cause fever, dehydration, and can progress to sepsis within days. Any unspayed female dog showing these symptoms 2-8 weeks after heat should be treated as an emergency.
Treatment: Emergency Surgery
The standard treatment is emergency ovariohysterectomy (spay surgery) — removal of the infected uterus and ovaries. Antibiotics alone are insufficient because they cannot clear the infection from the large pus-filled uterus. Surgery is more complex than a routine spay due to the enlarged, fragile uterus and the patient's compromised condition. IV fluids, antibiotics, and stabilization are provided before, during, and after surgery. Recovery is usually excellent once the infected uterus is removed.
Prevention
Spaying (ovariohysterectomy) completely prevents pyometra. Early spaying — before the first or second heat cycle — provides the best protection and also reduces the risk of mammary cancer. If you do not plan to breed your dog, spaying is the single most important health decision you can make. The cost of a routine spay is a fraction of the cost of emergency pyometra surgery.
- Your unspayed female dog has vaginal discharge after a heat cycle
- Your dog is drinking and urinating excessively, especially 2-8 weeks after heat
- Your dog has a swollen or painful abdomen
- Your dog is lethargic, vomiting, and not eating
- Your dog has a fever and appears unwell after being in heat
- You want to discuss spaying your female dog to prevent pyometra
Royal Veterinary Center provides 24/7 emergency care for pyometra and other reproductive emergencies. Our surgical team is experienced in emergency ovariohysterectomy with full anesthetic monitoring. We also offer routine spay surgery to prevent pyometra entirely — a simple procedure that protects your dog for life. For emergencies, call +853 6677 6611 immediately.
+853 6677 6611