The first 12 hours after vet discharge
Your 8 kg dog likely received gut protectants and anti-nausea medications at the clinic, which will help soothe irritation from the mustard seeds' compounds. The most immediate concern is rebound vomiting—if your dog brings up water or food within six hours of returning home, call your vet immediately. Small sips of water can be offered after the first two hours, but hold food until the vet confirms it's safe.
Mustard seeds contain isothiocyanates that may cause delayed heart rate changes, so stay alert for unusual fatigue or sudden panting without exertion. Keep your dog in a quiet space where you can observe resting breaths—normal is 15-30 per minute. Any spike above 40 while resting warrants an emergency callback.
Day two: assessing appetite and digestion
By tomorrow, your dog should show interest in food if the stomach lining is recovering. Offer a bland meal like boiled chicken and rice—about 1/4 cup for an 8 kg dog—but don't force it. Refusing two meals in a row suggests lingering nausea or gut inflammation that needs vet recheck. Watch stools closely; mustard seeds can sometimes cause mild diarrhea as they pass.
Paleness in the gums or a tacky feel to the mouth could indicate dehydration from earlier vomiting. Gently lift the skin at the scruff—it should snap back within two seconds. If it tents or your dog seems weaker than yesterday, skip the waiting period and head back to the clinic.
When to resume normal activity
For the next three days, avoid strenuous play or walks longer than 10 minutes. Mustard seed toxins can subtly affect muscle coordination, making stairs or jumps riskier than usual. If your dog stumbles or seems disoriented during light activity, stop and rest them immediately—these are rare but serious neurological signs needing prompt attention.
Monitor water intake carefully; drinking too much too fast could trigger more vomiting. Spread out small bowls (1/4 cup every hour) rather than leaving out a full dish. Normal urination should resume within 24 hours—any straining or dark urine means calling the vet.
Longer-term watch for small dogs
At 8 kg, your dog is more vulnerable to prolonged effects than a larger breed would be. Over the next week, check gums daily for a healthy pink color—not bright red or pale. Mustard compounds can sometimes cause low-grade anemia, which might show as tiredness during normally easy activities like climbing onto the sofa.
If your vet prescribed follow-up bloodwork, don't postpone it even if your dog seems fine. Some organ stress markers take 72 hours to appear. Keep other pets' food away during recovery, as the irritated stomach may react to unfamiliar fats or proteins. Stick to the bland diet for at least five days unless your vet advises otherwise.
The full verdict, portion guidance and serving notes are collected on the Mustard seeds food facts page.