Why soup makes stems more dangerous for a 12 kg dog
The warm liquid in soup may have softened the tomato stems, making them easier to swallow whole. Unlike raw stems, which dogs often spit out due to their bitter taste, cooked stems in broth can go down unnoticed. Your dog's weight means they have less body mass to dilute the solanine, so even a few stems warrant close watching.
Check the soup pot for leftover stems—knowing how many were in there helps gauge risk. Dogs this size can show gut irritation within two hours: pacing, lip-licking, or trying to eat grass. Nervous system signs like stumbling or dilated pupils would mean an emergency.
Soup ingredients that could worsen the reaction
If your soup contained garlic, onions, or fatty meats, these add separate risks. Solanine already stresses the stomach lining, and other irritants could amplify vomiting. Note whether the stems were boiled briefly or simmered for hours—longer cooking doesn't destroy solanine but may change how quickly it's absorbed.
With broth involved, dehydration is a concern if vomiting starts. Offer ice cubes rather than a full water bowl to prevent gulping too fast. Watch for dry gums or skin that tents when pinched—these mean your dog needs fluids at the vet.
When to skip monitoring and go straight to the vet
For a dog this size, any amount of stems eaten with liquid is concerning because absorption happens faster. If the soup was tomato-based (not just a few stems floating in chicken broth), the solanine dose could be higher. Dogs under 15 kg often show severe signs like tremors or slow heartbeat with smaller amounts.
Time matters here—if it's been over 30 minutes since eating, vomiting may not help. Instead, watch for subtle changes like restlessness or excessive yawning, which can precede worse symptoms. Call the clinic now if your dog has a history of sensitive stomach or prior poisoning episodes.
How to check for stem remnants in vomit or stool
If your dog vomits, look for fibrous green pieces—these confirm stem ingestion. Solanine causes bile-stained vomit that smells more bitter than usual food regurgitation. With soup, the vomit may be watery with visible fat droplets from the broth.
Over the next day, stools may appear darker green or contain undigested plant matter. Diarrhea from solanine often has a distinctive sharp odor. Save a sample if you need to visit the vet, but don't force your dog to eat or drink to produce one—fasting for 4-6 hours can calm an irritated gut.
The step-by-step response, from the first minute to the vet visit, is in our Tomato & Potato Plants (Solanine) emergency guide.