What to Track When Your Dog Has Vomiting or Diarrhea

Your dog threw up this morning and had loose stool by afternoon. You’re watching them, wondering if it’s a passing thing or the start of something serious. And when you eventually call your vet or walk into the clinic, the first question will be some variation of: “When did it start, how many times, and what did it look like?”

Most of us don’t have great answers to those questions. We remember “a few times” and “it looked bad,” which doesn’t give a vet much to work with. The difference between a one-off stomach upset and something that needs immediate intervention often comes down to the specific details you tracked, or didn’t.

Here’s exactly what to log, why each detail matters clinically, and when to stop tracking and start driving to the vet.

Why structured tracking matters more than you think

Gastrointestinal issues are one of the most common reasons dogs end up at the vet. The challenge is that vomiting and diarrhea are symptoms, not diagnoses: they can point to anything from a dietary indiscretion (your dog ate something they shouldn’t have) to a serious inflammatory condition.

Veterinary organizations like the American College of Veterinary Internal Medicine (ACVIM) and the World Small Animal Veterinary Association (WSAVA) have spent years developing standardized frameworks for evaluating GI symptoms. These frameworks exist because vague descriptions like “soft stool” or “threw up a lot” lead to clinical misinterpretation and diagnostic delays. The more precise your observations, the faster your vet can narrow down what’s happening.

You don’t need medical training. You just need to record the right things consistently.

The six things to track for every vomiting episode

When your dog vomits, write down these details each time it happens:

1. Time and date. This is the foundation. A single vomit at 6 AM after eating grass is a very different clinical picture than four episodes spread across 12 hours. Your vet needs the timeline to assess whether things are escalating or resolving.

2. Relation to food. Did the vomiting happen on an empty stomach, shortly after eating, or hours after a meal? Vomiting undigested food immediately after eating can suggest esophageal issues or eating too fast. Vomiting partially digested food hours later may point to a motility problem or obstruction.

3. What it looked like. This is where people get squeamish, but the visual character of vomit provides real diagnostic information. Note the color (yellow bile, white foam, brown, red-tinged), whether it contained food or was just liquid, and any unusual objects or materials. Yellow bile vomit on an empty stomach is extremely common and often benign. Anything red or dark brown that looks like coffee grounds warrants immediate attention.

4. Episode count. Track each individual episode, not just “vomited today.” The distinction between two episodes and six episodes in the same day changes whether your vet recommends monitoring at home or coming in.

5. What your dog did after. Did they perk up and ask for breakfast, or did they retreat to a corner and refuse to move? Behavior after vomiting is one of the best indicators of severity. A dog that vomits once and then acts completely normal is in a fundamentally different situation than a dog that vomits and then becomes lethargic.

6. Any suspected trigger. New food, a treat they don’t usually get, something they grabbed on a walk, a stressful event like a car ride or thunderstorm. This context is easy to forget 48 hours later but can be the key that unlocks a diagnosis.

What to track for diarrhea (and why a number beats an adjective)

“Soft stool” means something different to every person who says it. This is why veterinary practice has adopted standardized fecal scoring systems: they replace subjective descriptions with a number that means the same thing to every vet.

The most widely used is the Purina Fecal Scoring System, a 7-point scale that ranges from hard, dry pellets (score 1) to completely liquid, textureless puddles (score 7). For a healthy dog, you’re looking at a score of 2 to 3: a firm, log-shaped stool that holds its form when you pick it up. If you want a clearer breakdown of what each number means, see our 1–7 fecal scoring scale guide.

Here’s a simplified version of what each score range means:

• Scores 1-2: Very firm to firm. Normal to slightly dry. No concern unless persistent.
• Score 3: The ideal. Holds its shape, slightly moist surface, easy to pick up.
• Score 4: Soft and soggy. Still has a log shape but loses form when picked up. This is where you start paying attention.
• Scores 5-6: Piles rather than logs, losing defined shape. Clearly abnormal. Track frequency and duration.
• Score 7: Entirely liquid. No texture. This is urgent if sustained.

When logging diarrhea, record four things for each bowel movement:

The score (1-7). An important guideline from veterinary standards: if a single bowel movement has mixed consistency (partly firm, partly loose), record the worse score. This prevents underreporting.

Frequency. How many times did your dog defecate today, and is that more than their normal baseline? A dog that normally goes twice a day and is suddenly going five times is telling you something, even if the stool only scores a 4.

Visible abnormalities. Specifically look for three things: blood (and whether it’s bright red or dark/tarry), mucus (a glistening, jelly-like coating), and straining. These aren’t just “worse diarrhea” - they tell your vet whether the problem is in the small intestine or large intestine, which dictates a completely different diagnostic path.

Timing relative to meals. Diarrhea that consistently follows meals can suggest food intolerance or malabsorption. Diarrhea that happens at random times of day may point to an inflammatory or infectious process.

Small bowel vs. large bowel: why your vet will ask

Your vet may ask questions that seem oddly specific: “Are the volumes large or small?” or “Is there mucus?” These aren’t random. They’re differentiating between small bowel diarrhea and large bowel diarrhea, which are clinically distinct and treated differently.

Small bowel diarrhea typically means: large-volume stools, normal or only slightly increased frequency, watery consistency, possible dark tarry blood (melena), and often accompanied by weight loss in chronic cases.

Large bowel diarrhea looks different: small-volume stools with increased frequency and urgency, visible straining, bright red blood (hematochezia), and often mucus present.

If you’ve been tracking the details above, volume, frequency, blood color, mucus, straining, you’ll have exactly the data your vet needs to make this distinction without guessing.

When to stop tracking and call the vet immediately

Tracking is for monitoring and building a useful record. It is not a substitute for veterinary care. For a practical framework on when to monitor at home versus call versus seek emergency care, see when to call your vet. Based on AAHA urgent care guidelines, stop monitoring at home and seek veterinary attention if you observe any of the following:

Multiple vomiting episodes within 24 hours that show no sign of slowing down. Persistent, unrelenting vomiting can cause rapid dehydration and electrolyte imbalances, particularly dangerous for puppies, senior dogs, and small breeds.

Vomiting and diarrhea happening at the same time. The combination accelerates fluid loss dramatically. What might be manageable as isolated symptoms becomes dangerous together.

Blood in the vomit or stool. Bright red blood, dark tarry stool, or vomit that resembles coffee grounds all indicate mucosal damage or bleeding that needs medical evaluation.

Non-productive retching. If your dog is trying to vomit but nothing comes up, especially if combined with abdominal distension or restlessness, this could indicate gastric dilatation-volvulus (GDV, commonly called bloat), a life-threatening emergency most common in large-breed, deep-chested dogs. This one doesn’t wait.

Behavioral red flags alongside GI symptoms: profound lethargy, total refusal to eat or drink for more than 24 hours, signs of abdominal pain (hunched posture, reluctance to be touched), or any sudden behavioral change.

Symptoms lasting more than 48 hours without improvement, even if they seem mild. Chronic or worsening GI signs may indicate conditions like food-responsive enteropathy or other inflammatory conditions that need proper diagnosis.

Putting it together: a practical daily log

When your dog is having GI issues, here’s what a useful daily entry looks like:

March 15, 7:20 AM - Vomited yellow bile on empty stomach. No food in it. Seemed fine after, ate breakfast at 8 AM normally.

March 15, 11:00 AM - Loose stool in yard. Score 5, small volume, no blood or mucus, some straining. Second bowel movement today (normal is once).

March 15, 3:45 PM - Vomited partially digested food about 2 hours after lunch. Lethargic after, didn’t want to go for walk.

Three entries, maybe 30 seconds each, and you’ve given your vet a clinical timeline that’s infinitely more useful than “he’s been sick since yesterday.” You know the frequency (two vomiting episodes, one diarrhea episode), the trajectory (getting worse, the afternoon episode involved lethargy), and the specific details (bile vs. food, stool score and characteristics) that guide the next step. When you’re ready to turn daily notes into something appointment-ready, see preparing a symptom timeline for your vet. A printable symptom tracker template can also keep fields consistent day to day.

When GI issues become chronic: what changes

If your dog’s vomiting or diarrhea doesn’t resolve within a few days or keeps coming back, the clinical approach shifts. The ACVIM now classifies these chronic presentations as Chronic Inflammatory Enteropathy (CIE), a term that replaced the older, less precise “inflammatory bowel disease” label.

Under this framework, chronic GI issues are diagnosed through a stepwise process that often starts with a dietary trial, because research shows that anywhere from 38% to 89% of dogs with chronic GI inflammation are ultimately food-responsive. That means the first treatment your vet tries will likely be a diet change, not medication.

This is where sustained, structured tracking becomes especially valuable. An 8-week elimination diet trial requires daily logging of stool scores, appetite, energy level, and any symptom recurrence to determine whether the new diet is working. A missed detail during week 6 can undermine the entire trial.

We cover elimination diets in depth in a dedicated guide. For now, the key takeaway is that the tracking habit you build during an acute episode directly prepares you for managing a chronic one.

What this looks like in practice

Vetara was built specifically for this kind of structured health tracking. Every detail mentioned in this post, vomit episodes with timing and visual descriptions, stool scores on a 1-7 scale, appetite changes, medication doses, behavioral observations, maps to a structured event type in the app. You log it once, and it becomes part of a searchable timeline you can filter by symptom type, generate into a vet-ready report, or share directly with your veterinary team.

You don’t need an app to do this. A notebook works. The important thing is that you do it consistently, with the right level of detail, so that when your vet asks “when did this start and what’s it been like?” you have a real answer.

But if you want something that turns those observations into structured data your vet can actually use, that’s what we built.

Related guides

• cat eating and drinking habits after illness
• logging medication side effects