Pyometra

Pyometra in Female Dogs: What Owners Need to Know

Pyometra is a serious uterine condition that can develop in un-spayed female dogs. It involves inflammation of the uterus and the build‑up of fluid or discharge. While it is more common in older females, it can occur at any age, which is why awareness is so important.

Who Is Most at Risk?

Pyometra is most often seen in:

• Intact females over five years old

• Dogs experiencing repeated heat cycles

• Dogs with a history of hormonal fluctuations

Although younger dogs can also be affected, the risk increases with age and repeated cycles.

Understanding Why It Happens

Female dogs typically come into season twice a year. During each cycle:

• White blood cell activity in the uterus decreases, allowing sperm to pass — but also reducing natural defence against bacteria.

• Progesterone levels stay high for several weeks, thickening the uterine lining.

• The cervix opens during oestrus, creating an opportunity for bacteria to enter.

Over time, repeated cycles can cause cystic changes in the uterine lining. These changes may produce fluid, creating an environment where bacteria can multiply more easily. Elevated progesterone also reduces the uterus’s ability to contract, making it harder for the body to clear this fluid.

Signs to Watch For

Pyometra can progress quickly, so recognising early changes is essential.

Early signs may include:

• Behaviour changes (clinginess, withdrawal, irritability)

• Increased thirst

• Lethargy

• Reduced appetite

  
  

More advanced signs may include:

• Weakness or excessive panting

• Vomiting

• Abdominal swelling

• Marked increase in drinking

• High temperature

Some dogs may also have a vaginal discharge, but this is not always present.

Why Early Veterinary Care Matters

Pyometra is a medical emergency. If your dog shows any of these signs after a heat cycle — even mild ones — contact your vet immediately. Prompt assessment helps ensure the safest and most effective care plan.

Supporting Recovery After Veterinary Treatment

Dogs recovering from pyometra — whether managed medically or surgically — often benefit from gentle nutritional support as they regain strength. Our Recovery From Illness or Surgery blog explores how to nourish dogs during healing, including tips on appetite, hydration, and choosing foods that are easy to digest.

This guidance is designed to complement your vet’s advice and help you support your dog’s wellbeing during recovery.