TL;DR: Coffee ground vomit in cats is a sign of digested blood and indicates a life-threatening veterinary emergency that requires immediate medical attention. Taking a photo of the vomit can help the emergency team quickly triage your cat and determine the best diagnostic path.
What does it mean if my cat is vomiting material that looks like coffee grounds?
If your cat is vomiting liquid that resembles dark, gritty coffee grounds, it is a sign of hematemesis, or vomiting blood. The "coffee ground" appearance occurs when blood has been present in the stomach long enough to be partially digested by stomach acid. This process causes the blood to oxidize, turning it from bright red to a dark, granular brown or black color.
Is coffee ground vomit a veterinary emergency for my cat?
- The urgency level for this symptom is High, as it typically indicates significant internal bleeding in the upper gastrointestinal tract.
- Potential causes include gastric ulcers, the ingestion of rodenticides or other toxins, foreign body obstructions, or severe inflammatory disease.
- Because internal bleeding can rapidly lead to life-threatening anemia or shock, you should transport your cat to an emergency veterinary clinic immediately.
How does taking a photo of the vomit help the veterinarian triage my cat?
- Providing the veterinary team with a clear photo allows the staff to confirm the presence of digested blood and assess the volume lost.
- Visual evidence helps the veterinarian determine the level of urgency without you having to bring a physical sample.
- The photo assists the medical team in choosing the most appropriate and rapid diagnostic path for your pet.
Clinical Context (Merck Veterinary Manual)
In cats, vomitus that resembles coffee grounds suggests the presence of digested blood, potentially stemming from a bleeding lesion such as a gastric ulcer or neoplasm. Other causes of vomiting with or without digested blood include dietary indiscretion, drug or toxin ingestion (e.g., antibiotics, NSAIDs, corticosteroids, plants, chemicals), systemic illness (e.g., pancreatitis, uremic gastropathy, hypoadrenocorticism), endoparasitism (e.g., Ollulanus sp), or bacterial (e.g., Helicobacter-associated disease) or viral infection (e.g., feline panleukopenia). Diagnosis is typically based on a thorough history, clinical findings, and response to symptomatic treatment.
Chapter: Pharmacology
Source: The Merck Veterinary Manual, 11th Edition (Page 2547)