How bacterial toxins work faster than you'd expect
At 10 kg, your dog's body size makes him vulnerable to rapid-onset food poisoning from overnight crawfish. Bacteria like Bacillus cereus produce heat-stable toxins that begin irritating the stomach lining within 1-3 hours. Unlike fresh seafood reactions that take longer to develop, spoilage-related vomiting often arrives suddenly and violently.
Watch for the 'pre-vomit' signs: excessive swallowing, floor-licking, or restless pacing. Dogs often seek grass when nausea builds. The high protein content of crawfish tails can make vomitus smell particularly foul — this intensity reflects bacterial breakdown products rather than the original food's freshness.
Why your dog's weight affects the timeline
Smaller dogs (under 15 kg) typically show food poisoning symptoms within 4-6 hours because their higher metabolic rates process toxins faster. Your 10 kg companion is right in the window where vigilance matters most tonight. While the amount consumed was small, spoiled seafood toxins are potent in tiny doses.
Check his gums — they should be moist and pink, not tacky or pale. Dehydration sets in quickly with vomiting, and crawfish's natural salt content exacerbates fluid loss. Offer ice cubes if he refuses water; the cold helps soothe irritated stomach lining while providing gradual hydration.
The difference between seafood allergy and spoilage reaction
True shellfish allergies are rare in dogs, so tonight's reaction (if it occurs) likely stems from bacterial toxins rather than the crawfish itself. Allergy symptoms like facial swelling or hives would appear regardless of food freshness, while spoilage reactions focus on gastrointestinal distress.
Monitor for 'productive' versus 'non-productive' vomiting — bringing up food or fluid suggests his system is handling the irritant, while dry heaving or retching without output could indicate a more serious blockage or toxin effect. The presence of diarrhoea alongside vomiting increases dehydration risks substantially.
When to stop waiting and start acting
Most spoiled food reactions peak within 8 hours — if vomiting persists beyond that window or includes blood (fresh red or coffee-ground appearance), his system isn't coping effectively. At 10 kg, fluid loss becomes dangerous faster than owners expect. Sunken eyes or skin that tents when gently pulled are late-stage dehydration signs.
Create a recovery area with easy-to-clean surfaces and familiar bedding. Dogs often feel chilled after vomiting episodes; a slightly warmed (not hot) water bottle wrapped in a towel can provide comfort. Avoid offering food for at least 6 hours after the last vomiting episode to let his stomach lining recover.
The full verdict, portion guidance and serving notes are collected on the Crawfish food facts page.