27/08/2026
So important to steralise
PYOMETRA IN DOGS
The silent, life-threatening infection every dog owner should know about
Pyometra is a serious and potentially fatal infection of the uterus (womb) that can affect unsterilised female dogs.
Although pyometra can occur in a younger dog, the risk increases as an unsterilised female gets older and goes through repeated heat cycles. It is particularly important to be aware of the risk in females from around 4–5 years of age onwards. (Cornell Vet College)
WHAT HAPPENS?
After a female dog has been in heat, hormonal changes cause the lining of the uterus to thicken. This can create an ideal environment for bacteria to multiply.
The uterus can then become filled with infected fluid and pus.
And this is where pyometra becomes extremely dangerous.
The bacteria and their toxins can enter the bloodstream, potentially causing sepsis, organ failure, shock and death if treatment is delayed. (Cornell Vet College)
WATCH FOR THESE WARNING SIGNS:
• Drinking much more water than normal
• Urinating more frequently
• Loss of appetite
• Lethargy or depression
• Vomiting
• Fever
• A swollen or painful abdomen
• Weakness or collapse
• Cream, yellow, bloody or foul-smelling discharge from the v***a
But there is an important warning:
NO DISCHARGE DOES NOT MEAN NO PYOMETRA!
With an open pyometra, infected material can drain through the va**na and may be noticed by the owner.
With a closed pyometra, the cervix is closed and the infected material remains trapped inside the uterus. There may be no visible discharge at all — and this form can become extremely dangerous very quickly. (Cornell Vet College)
WHEN DOES IT HAPPEN?
Pyometra commonly develops a few weeks after a heat cycle, so if your unsterilised female dog becomes unwell after being in season, pyometra should always be considered. (Merck Veterinary Manual)
HOW IS IT TREATED?
Pyometra is a veterinary emergency.
The usual and most effective treatment is surgery to remove the infected uterus and ovaries — essentially an emergency spay. Dogs may also require intravenous fluids, antibiotics and intensive monitoring.
Emergency pyometra surgery is considerably more complicated and risky than a routine spay on a healthy dog. (Cornell Vet College)
CAN IT BE PREVENTED?
Yes.
Spaying a female dog prevents the vast majority of pyometra cases because the uterus and ovaries are removed before the infection can develop. (Cornell Vet College)
If your female dog is not intended for breeding, speak to your veterinarian about the most appropriate time to have her spayed.
PLEASE DON’T WAIT.
A dog with pyometra may initially appear simply “a little off”.
But pyometra can progress rapidly.
If your unsterilised female dog is lethargic, not eating, vomiting, drinking excessively, has va**nal discharge, or simply doesn’t seem right — especially after a recent heat — contact your veterinarian immediately.
Pyometra is painful.
Pyometra is dangerous.
Pyometra can be fatal.
But pyometra is preventable.