Dog Pyometra: Emergency Uterine Infection

Pyometra is a life-threatening uterine infection in intact female dogs requiring prompt emergency treatment to prevent death.

Key Facts

Pyometra is a uterine infection affecting intact female dogs, most commonly after a heat cycle
It occurs in two forms: open pyometra (vaginal discharge present) and closed pyometra (no discharge, more dangerous)
Approximately 25% of intact female dogs develop pyometra by age 10
Clinical signs include increased drinking, lethargy, vomiting, vaginal discharge (if open), and abdominal distension
Emergency ovariohysterectomy (spay) is the definitive treatment and is curative
Medical management with prostaglandins is possible in selected cases where breeding is intended but carries higher risk

Welfare Considerations

Pyometra causes severe welfare harm through systemic sepsis, toxemia from bacterial endotoxins, and the pain of uterine distension. Closed pyometra is particularly dangerous because the absence of discharge means owners may not recognize the severity until the dog is in critical condition with septic shock. The rapid deterioration from initial lethargy to critical sepsis can occur within 48 hours. Emergency surgery, while high-risk in a septic patient, is lifesaving and definitively curative. The welfare case for routine neutering of dogs not intended for breeding is partly based on pyometra prevention - removing the risk entirely for approximately 25% of intact females who would otherwise develop this serious condition.

What You Can Do

Recognize pyometra warning signs in intact female dogs: lethargy, increased drinking, vomiting after a heat
Treat any suspected pyometra as a veterinary emergency requiring same-day assessment
Do not delay treatment while waiting for improvement - the condition deteriorates rapidly
Consent to emergency surgery promptly - delay significantly worsens outcomes and welfare
Discuss routine neutering of non-breeding female dogs to prevent pyometra entirely
After recovery, neuter your dog if breeding is no longer planned to prevent future episodes