TL;DR: If your dog's heat-related bleeding lasts over three weeks, schedule a vet visit within 48 hours, or sooner if they show signs of lethargy or infection. A photo of the discharge can significantly assist in a fast, accurate diagnosis.
What defines prolonged bleeding during my dog's heat cycle?
A typical heat cycle in dogs, known as estrus, generally lasts between two to four weeks. The proestrus phase, where bleeding is most prominent, usually lasts about 7 to 10 days. Prolonged bleeding occurs when your dog continues to discharge blood for more than three weeks, or if the bleeding stops and then restarts suddenly. This can be caused by hormonal imbalances, uterine polyps, or more serious conditions like ovarian cysts or infections.
How quickly does my dog need to see a vet for prolonged bleeding?
- Schedule a veterinary examination within 24 to 48 hours, as prolonged bleeding is considered a medium urgency situation.
- Seek immediate emergency care if the bleeding is accompanied by extreme lethargy or a foul odor.
- Watch for excessive water consumption, which can be a sign of a life-threatening uterine infection called Pyometra.
How can a photo of the discharge help my veterinarian with triage?
- Capture a clear photo of the discharge on a white paper towel or bedding to help the medical team assess color, consistency, and volume.
- Photos help your vet differentiate between bright red fresh blood and darker, older blood or mucoid discharge.
- Providing a visual aid allows for a faster and more accurate diagnosis before your dog even enters the exam room.
Clinical Context (Merck Veterinary Manual)
Prolonged estrus in dogs, characterized by extended bleeding during heat, may be caused by ovarian cysts that produce estrogen, functional ovarian tumors, or exposure to exogenous estrogens. A slight vaginal discharge may also be present. Diagnosis is based on history, physical examination, biochemical evaluation, and ultrasonography. Laparotomy with histopathology is usually indicated, because medical attempts at inducing ovulation are usually unrewarding. Veterinarians should be consulted if bleeding is excessive, prolonged, or accompanied by other concerning signs like lethargy, inappetence, or pain, as these could indicate underlying complications requiring intervention.
Chapter: Reproduction
Source: The Merck Veterinary Manual, 11th Edition (Page 1399)