Why wobbliness means urgent vet care for one dog
When a dog shows unsteady movement after eating mustard seeds, it suggests the toxins have started affecting their nervous system or heart rhythm. The amount your dog consumed—a teaspoon—is enough to cause these serious effects in some animals, especially smaller breeds. Time matters here: the sooner they get veterinary treatment to stabilize their heart and flush out toxins, the better their chances of avoiding lasting damage.
Vets may administer IV fluids to support circulation, run an ECG to monitor heart activity, and provide medications to counteract the mustard seed's effects. There’s no safe waiting period when wobbliness appears—this is an emergency. Even if your dog seems to improve briefly, hidden heart issues could still develop over the next 12 hours without professional care.
Why the uneexposed dog needs no treatment
Your second dog is safe because mustard seed toxicity requires actual ingestion—it doesn’t spread through air, saliva, or shared bowls. Unless they licked residue off the first dog’s fur (unlikely with seeds), there’s zero exposure. Unlike contagious illnesses or environmental toxins, the danger here is entirely about what each animal individually consumed.
That said, do keep all mustard products far away from both pets going forward. Dogs often share food-seeking behaviors, so what one finds tempting today, the other might try tomorrow. Store spices in sealed cabinets, and wipe counters after cooking to remove any stray seeds that could tempt curious noses.
How to monitor the unaffected dog without overreacting
For your non-exposed dog, normal routines can continue—no special observation is needed beyond general good pet care. Watch for unrelated signs like vomiting or diarrhea, which could indicate they ate something else while you were distracted by the emergency. But specifically for mustard seeds? No symptoms will develop without actual consumption.
If you’re feeling anxious, check their gums (should be pink, not pale) and offer a favorite toy to gauge their usual energy level. Healthy dogs remain playful and hungry; any dramatic change in behavior warrants a vet call regardless of mustard exposure. But in this case, their safety is guaranteed by their lack of contact with the seeds.
Preventing future incidents with two dogs
Multi-dog households face extra risks because competitive eating can lead to faster ingestion—one pet may gulp dangerous items to keep them from the other. Train both dogs to "leave it" when you spot them investigating spills, and feed them separately if food aggression exists. For high-value temptations like spicy human foods, keep pets out of the kitchen entirely during meal prep.
Consider storing emergency vet numbers in both your phone and a visible spot at home, since time pressure increases with multiple pets. While today’s situation involved only one affected dog, future accidents could differ. Quick access to professional advice helps you stay calm when seconds count.
The full verdict, portion guidance and serving notes are collected on the Mustard seeds food facts page.