Why Is My Dog Vomiting? Causes, Urgency & What to Do
Most single-episode vomiting in dogs is benign and resolves on its own. However, repeated vomiting (3+ times in 24 hours), vomiting with blood, or vomiting combined with lethargy warrants a same-day vet visit. Rio can help you assess urgency in real time.
Why Do Dogs Vomit?
Vomiting is one of the most common reasons dog owners contact a veterinarian — or turn to Rio at 2am. It's a protective reflex that helps dogs expel harmful substances from their stomach, but it can also signal underlying conditions that need attention.
The key question isn't whether your dog vomited — it's the context. A single episode after eating grass is very different from repeated vomiting with lethargy and loss of appetite. Let's break down the most common causes.
Most Common Causes
Eating something they shouldn't — table scraps, rubbish, foreign objects. The number one cause of acute vomiting in dogs.
Inflammation of the stomach lining, often from food changes, stress, or mild infections. Usually self-limiting.
Especially in puppies. Most dogs outgrow it, but some need medication for car journeys.
Inflammation of the pancreas, often triggered by high-fat foods. More common in middle-aged and senior dogs.
Swallowed toys, bones, or fabric blocking the GI tract. This is an emergency — look for repeated non-productive vomiting.
Chocolate, grapes, xylitol, certain plants, medications. Time-critical — contact a vet immediately if suspected.
When to Worry — Red Flags
- Vomiting blood or dark 'coffee ground' material
- Repeated vomiting (3+ times in 24 hours)
- Vomiting combined with lethargy, diarrhoea, or refusal to eat
- Swollen or painful abdomen
- Known or suspected ingestion of a toxic substance
- Vomiting in a puppy under 6 months or a senior dog over 10
What to Do at Home
Give the stomach time to settle. This is safe for healthy adult dogs — not puppies or diabetic dogs.
Prevent dehydration but avoid letting them drink large amounts at once, which can trigger more vomiting.
After the fast, offer boiled chicken and white rice in small portions every 4-6 hours for 2-3 days.
Note the colour, frequency, and contents of vomit. Take photos — your vet will appreciate this. Rio can help you track symptoms over time.
How Rio Can Help
Rio analyses your dog's symptoms in real time, cross-referencing breed, age, and medical history to give you personalised urgency assessments. Upload a photo, describe what you're seeing, and Rio will tell you whether to monitor at home, schedule a routine visit, or head to the emergency vet.