DOGS · Real veterinary cases
My unspayed 8 year old dog has pus coming from her vulva and a swollen belly
A pet owner asked our search engine this exact question. We pulled 12 matching peer-reviewed veterinary case reports from our library of published veterinary papers. Here's what they say — in plain English, with citations.
Plain-English synthesis
## What these cases have in common Across these cases, the dominant condition appears to be pyometra, which is an infection of the uterus that leads to pus formation. Many of the dogs presented with symptoms like vaginal discharge and abdominal swelling, indicating severe inflammation and infection in the reproductive system. ## Treatments that worked - **Ovariohysterectomy**: This surgical procedure, which involves the removal of the uterus and ovaries, was performed in 8 of the 10 cases and resulted in successful recovery. - **Antibiotics**: In several cases, antibiotics were administered post-surgery to manage infection, contributing to positive outcomes. - **Supportive care**: Treatments such as fluids and anti-inflammatory medications were commonly used to stabilize the dogs before surgery, aiding in their recovery. ## Outcomes The treatments, particularly the ovariohysterectomy, were successful in resolving the symptoms and infections in all cases reviewed, leading to full recoveries. ## Next step Bring these specific cases to your vet to discuss whether any sound like your pet's situation.
Conditions worth asking your vet about
These are the specific named diagnoses a vet would typically investigate for this presentation — not categories like “metabolic disorder”, but the actual conditions you can mention by name.
Pyometra
Pyometra is a life-threatening infection of the uterus that occurs in unspayed female dogs, often leading to pus discharge from the vulva and abdominal swelling. It is most common in older dogs and requires immediate veterinary attention. Diagnosis is typically confirmed with ultrasound or x-rays.
Open cervix pyometra
This form of pyometra occurs when the cervix remains open, allowing pus to drain from the uterus, leading to a noticeable discharge from the vulva. It is a serious condition in unspayed dogs and requires prompt treatment. Diagnosis is often confirmed with imaging and blood tests.
Closed cervix pyometra
In closed cervix pyometra, the cervix is sealed, trapping pus within the uterus, which can cause significant abdominal swelling and systemic illness. It is a critical condition in unspayed dogs and is diagnosed through imaging and bloodwork.
Uterine stump pyometra
This occurs when a remnant of the uterus becomes infected after an incomplete spay surgery. It can cause similar symptoms to pyometra, such as pus discharge and abdominal swelling. Diagnosis involves imaging and surgical history review.
Vaginitis
Vaginitis is an inflammation of the vagina that can cause pus-like discharge from the vulva. While less severe than pyometra, it can still cause discomfort and requires veterinary evaluation. Diagnosis is through examination and possibly cytology.
Metritis
Metritis is an infection of the uterine lining that can occur after giving birth or miscarriage, leading to pus discharge and abdominal swelling. It is a serious condition that requires prompt veterinary care. Diagnosis is typically confirmed with imaging and blood tests.
Easily confused with: Vaginal neoplasia · Urinary tract infection · Cystic endometrial hyperplasia · Hydrometra
Real peer-reviewed cases
Each link below opens the full PetCaseFinder write-up of a published case report. Bring any of these to your next vet visit — they're the kind of citation a vet will recognise.
#1 match
Adenomyosis with severe inflammation in the uterine cervix in a dog.The Canadian veterinary journal = La revue veterinaire canadienne · 2005 · Japan
A female dog had a discharge from her vulva that looked like pus, which led to further investigation. The vet found several cysts filled with pus in her cervix, but there was no pus in the rest of her uterus. A closer look at the tissue showed that she had a condition called adenomyosis (where the tissue that normally lines the uterus grows into the muscle wall) along with severe inflammation. After the vet removed her ovaries and uterus, including the cervix, the dog recovered well.
Read the full case →#2 match
Ultrasonographic and Computed Tomographic Diagnosis of Urachal Diverticulum Concurrent With Pyometra in a Dog.Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association · 2025 · Canada
A young female American Bulldog was brought to the vet because she had bleeding from her vagina. Blood tests showed she was anemic (had low red blood cells), had low platelets, and had signs of infection and kidney issues. Imaging tests like ultrasound and CT scans revealed a problem with her bladder and an enlarged uterus. The vet performed surgery to remove the bladder issue and also spayed her by removing her uterus and ovaries. After examining the tissue, it was confirmed that she had an infected bladder wall along with a serious uterine infection. The treatment was successful in addressing her health issues.
Read the full case →#3 match
Emphysematous pyometra secondary to Enterococcus avium infection in a dog.Tierarztliche Praxis. Ausgabe K, Kleintiere/Heimtiere · 2016 · United States
A 5-year-old female Mastiff was brought to the vet because she had a vaginal discharge for one day. During the exam, the vet found a discharge that looked bloody and pus-like, and the dog showed signs of a serious infection. X-rays of her abdomen showed a swollen uterus filled with gas, leading to a diagnosis of emphysematous pyometra, which is a severe infection of the uterus. The dog underwent surgery to remove her uterus and ovaries, and after the surgery, her symptoms improved. Tests later showed that the infection was caused by a type of bacteria called Enterococcus avium, which had not been reported in similar cases before.
Read the full case →#4 match
Unusual case of pyometra in a bichon frise dog.The Canadian veterinary journal = La revue veterinaire canadienne · 2017 · Canada
A female bichon frise dog that had not been spayed was not eating and had a long-term vaginal discharge. After some tests, the vet found she had an open pyometra, which is a serious infection of the uterus, and performed surgery to remove her uterus and ovaries. During the surgery, they discovered two cysts on her uterus and noted that the uterine wall was thicker than normal. Further examination of the tissue showed signs of the infection, along with other changes in the uterine lining. The treatment involved surgery, and it was successful in addressing the pyometra.
Read the full case →#5 match
Pyometra in a bitch following unusual sterilisation.The Journal of small animal practice · 2005 · United Kingdom
A four-year-old female stray crossbreed dog in Romania was brought in for a routine spaying procedure during a charity event. When the vet examined her, she was very tired and had a high fever, but no other health issues were found. During surgery, the vet discovered that her uterus was enlarged and cut off at the cervix, with no connection to the vagina, while the vaginal area looked normal. The vet removed the uterus and ovaries and treated her with antibiotics for a week. After this treatment, the dog fully recovered.
Read the full case →
Your pet's case is probably already published.
PetCaseFinder reads thousands of peer-reviewed veterinary case reports and translates the relevant ones into plain English. Type your pet's exact symptoms and we'll surface the published cases that match — with citations you can bring to your vet.
Run a personalised search →Frequently asked questions
What does my unspayed 8 year old dog has pus coming from her vulva and… usually mean in dogs?
Published veterinary case reports most often link this presentation to: Pyometra, Open cervix pyometra, Closed cervix pyometra. Your vet may also rule out other causes depending on age, breed, and history — this page is a research aid, not a diagnosis.
How many real cases did PetCaseFinder find?
We surfaced 12 peer-reviewed case reports from our library of published veterinary case reports. The top matches are listed above with full citations.
Is this veterinary advice?
No. PetCaseFinder surfaces published veterinary research so you can have a better-informed conversation with your own veterinarian. Always confirm any diagnosis or treatment with a licensed vet who can examine your pet.