TL;DR: Heavy vaginal bleeding outside of a normal heat cycle is a high-priority medical emergency that requires immediate veterinary attention to rule out life-threatening conditions like pyometra or internal trauma.
What are the signs of heavy vaginal bleeding in dogs and where does it come from?
Heavy bleeding from the vulva that occurs outside of a dog's regular heat cycle (estrus) is an abnormal clinical sign. While light spotting is normal during heat, active hemorrhage or heavy dripping indicates a potentially serious underlying health issue. This bleeding may originate from the uterus, the vaginal wall, or even the urinary tract, and it requires professional assessment to determine the source.
Is heavy vaginal bleeding in a dog considered a medical emergency?
Urgency Level: High. Yes, heavy bleeding from the vulva when a dog is not in heat is a medical emergency. This symptom can be a sign of life-threatening conditions including:
- Pyometra (a severe uterine infection)
- Reproductive tract tumors
- Significant internal trauma
- Blood clotting disorders
If your dog also appears lethargic, has pale gums, or is panting excessively, seek emergency veterinary care immediately.
Why should I take a photo of my dog's vaginal bleeding to help with triage?
- If it is safe to do so, take a clear photograph of the bleeding and any discharge to assist the triage process.
- A photo allows the veterinary team to evaluate the color, volume, and consistency of the blood before you arrive at the clinic.
- This visual information helps the medical staff prepare the necessary diagnostic tools and prioritize your dog’s treatment based on the severity of the blood loss.
Clinical Context (Merck Veterinary Manual)
Hemorrhagic uterine discharge from the vulva in young bitches (<3 years old) several weeks postpartum may indicate subinvolution of placental sites (SIPS), a diagnosis of exclusion from metritis, vaginitis, and cystitis. A purulent vulvar discharge, often containing blood, can be a sign of pyometra when the cervix is open, accompanied by lethargy, anorexia, polyuria, polydipsia, and vomiting, potentially progressing rapidly to shock and death. Vaginal hyperplasia, a proliferation of the vaginal mucosa during proestrus and estrus due to estrogenic stimulation, can cause a mass protruding from the vulva, potentially with a slight vaginal discharge.
Chapter: Reproduction
Source: The Merck Veterinary Manual, 11th Edition (Page 1399)