What diarrhoea reveals about seed toxicity
Your dachshund's diarrhoea appearing just two hours post-ingestion indicates rapid gut irritation from the mustard seeds. At 5 kg, his small intestinal surface area makes him vulnerable to fluid loss — watch for mucus in the stool or straining without production. These seeds contain compounds that directly inflame the intestinal lining, unlike simple food intolerance which usually takes longer to develop.
The speed of symptom onset suggests significant toxin absorption. Limit his activity to prevent dehydration exacerbation, and offer small ice cubes if he's thirsty. Don't administer over-the-counter diarrhoea medications, as they may trap toxins in his system longer.
Neurological risks beyond gastroenteritis
Mustard seeds' less-discussed danger is their potential to cause neurological signs in small dogs. Your dachshund's elongated spine makes him particularly susceptible to weakness or coordination issues if toxins affect nerve function. Observe his gait closely — any stumbling, crossed legs, or difficulty rising would indicate the situation has escalated beyond simple digestive upset.
His low body weight means even the 'few seeds' you mentioned could push him toward toxicity thresholds. Time matters here — if diarrhoea persists beyond four hours or contains blood, he needs veterinary assessment to prevent hypovolemic shock from fluid loss.
The critical 12-hour observation window
Most mustard seed reactions peak within 12 hours, but complications can arise later. Your dog's short digestive tract processes items quickly, so ongoing diarrhoea beyond this period suggests significant mucosal damage. Check his gums for pallor and his skin for tenting (slow retraction when pinched), both signs of advancing dehydration.
Small breeds decompensate rapidly — a 5 kg dog can lose dangerous amounts of electrolytes through diarrhoea faster than owners expect. If he stops responding to treats or ignores familiar commands, this mental dullness signals worsening systemic effects.
When to bypass monitoring for direct care
Certain developments mean your dachshund shouldn't wait for an appointment. Rapid breathing when resting, glazed eyes, or collapse all indicate cardiovascular involvement requiring emergency intervention. His breed's predisposition to back problems also means any uncoordinated movements could reflect either neurological toxicity or disc issues triggered by vomiting strains.
Prepare a stool sample photograph (color, consistency) and note the frequency of bowel movements. This helps the vet assess whether he needs intravenous fluids or gut protectants beyond basic symptomatic care.
The full verdict, portion guidance and serving notes are collected on the Mustard seeds food facts page.