TL;DR: Nasal bleeding in dogs is usually a medium-priority issue requiring a vet visit within 24–48 hours, but profuse bleeding or signs of respiratory distress require immediate emergency care.
What causes my dog to sneeze a spray of blood?
Seeing your dog sneeze blood, known as epistaxis, occurs when blood vessels in the nasal passages are damaged. Potential causes include:
- Foreign objects lodged in the nose (like grass seeds)
- Fungal or bacterial infections
- Dental disease affecting the upper jaw
- Nasal tumors or blood clotting disorders
When is sneezing blood a veterinary emergency?
While often categorized as medium urgency, certain symptoms require immediate intervention. Seek care based on these guidelines:
- Within 24 to 48 hours: If your dog is otherwise energetic and breathing comfortably.
- Immediate emergency care: If the bleeding is profuse and continuous.
- Immediate emergency care: If your dog has pale gums, lethargy, or difficulty breathing.
How does taking a photo of the blood spray help the vet?
Capturing a photo of the discharge and your dog's nose provides critical visual evidence that helps your veterinarian:
- Determine the volume of blood loss
- Identify if the discharge is unilateral (one nostril) or bilateral (both nostrils)
- Assess the specific color of the blood
- Prioritize your dog's case and choose the correct diagnostic tests
Clinical Context (Merck Veterinary Manual)
Epistaxis (bleeding from the nose) and sneezing in dogs can be caused by oronasal neoplasia, dental disease (oronasal fistula), nasal foreign body, or nasopharyngeal disease (foreign body or mass lesions). Diagnostics should include a CBC, serum chemistry profile, and urinalysis to exclude concurrent systemic disease. If epistaxis is present, a one-stage prothrombin time, partial thromboplastin time, and buccal mucosal bleeding time should be considered, along with a platelet count. Imaging of the nasal chambers via nasal/dental radiographs or CT is valuable. Rhinoscopy, retroflex nasopharyngoscopy, nasal flushing, and nasal biopsy are useful diagnostic tools but should be delayed until after imaging to avoid iatrogenic changes. Advanced imaging and biopsy may identify a specific etiologic diagnosis for nasal discharge (e.g., fungal rhinitis, neoplasia, foreign body) in a notable percentage of dogs with chronic nasal disease.
Chapter: Otorhinolaryngology, Diagnostic Imaging, Clinical Pathology
Source: The Merck Veterinary Manual, 11th Edition (Page 1480)