What Is Pyometra in Dogs?
Pyometra is a common and highly dangerous disease affecting un-spayed female dogs. Many owners, seeing their dogs become lethargic and lose appetite, may mistake it for a minor illness—missing the golden window for treatment. If not treated promptly, bacterial toxins from pyometra can lead to sepsis or even acute kidney failure, with potentially fatal consequences.
"Never let the sun set on a pyometra" — a reminder of just how fast things can go from manageable to fatal.
Pyometra is most commonly seen in middle-aged to older, un-spayed female dogs, typically occurring 2 to 8 weeks after a heat cycle. About one in four older, unneutered female dogs will suffer from pyometra.
Two Types: Open vs. Closed Pyometra
| Type | Cervix Status | Characteristics | Danger Level |
|---|---|---|---|
| Open | Open | Pus can drain; easier for owners to detect | Emergency |
| Closed | Closed | Pus cannot drain; toxins enter bloodstream rapidly | Extremely Dangerous |
Recognising the Signs
| What You Observe | What It May Mean | Action Required |
|---|---|---|
| Increased thirst and urination | Toxins affecting kidney function | Seek same-day care |
| Lethargy and fever | Active inflammatory response | Treat as an emergency |
| Loss of appetite / Vomiting | Systemic infection | Seek immediate care |
| Abdominal swelling and pain | Enlarged or inflamed uterus | Contact emergency vet |
| Abnormal vaginal discharge | Open pyometra (foul odour) | Seek same-day care |
Causes & Risk Factors
- Bacterial Infection: E. coli entering the uterus during/after heat.
- Hormonal Fluctuations: Progesterone thickening the uterine lining.
- Age: Risk accumulates with each consecutive heat cycle.
- Status: Being an un-spayed female is the primary risk factor.
Treatment (Emergency Spay)
- Ovariohysterectomy: Complete removal of uterus and ovaries.
- Stabilisation: IV fluids to correct dehydration and imbalances.
- Hospitalisation: 2 to 5 days for monitoring and recovery.
- Success Rate: Up to 100% survival with early diagnosis.
Post-Operative Care
Protection
Wear an Elizabethan collar (cone) at all times to prevent licking/biting.
Wound Care
Daily checks for redness, swelling, or discharge. Do not apply home meds.
Restricted Activity
No running, jumping, or stairs for 7-14 days. Short leash walks only.
Nutrition
Small, frequent meals of easily digestible or prescription food as directed.
Life-Threatening Emergency
If you suspect your dog has pyometra, do not wait. This condition progresses rapidly and can be fatal within a very short time. Seek professional veterinary help immediately.