How THC and spoilage interact in a 12 kg dog
When a dog eats an old THC brownie, two factors compete for urgency: the THC's neurological effects and potential bacterial growth from spoilage. While spoiled food can cause vomiting or diarrhea, THC acts faster and more severely in dogs. Even small amounts can trigger wobbliness, disorientation, and trouble regulating body temperature—symptoms that need monitoring regardless of the brownie's freshness.
The chocolate in the brownie adds another layer of risk, especially if it's dark or baker's chocolate. Check whether the dessert contained raisins, macadamia nuts, or xylitol, as these commonly found in baked goods escalate the emergency. Focus first on THC symptoms, but expect possible gastrointestinal upset from spoilage within 4-6 hours.
Why timing matters with THC absorption
THC reaches peak blood concentration in dogs within 1-3 hours after ingestion, so your dog may seem fine at first before suddenly becoming uncoordinated. The overnight-aged brownie might have lost some potency, but THC degrades slowly—enough likely remains to cause concerning sedation in a medium-sized dog.
Watch for glassy eyes, slow reactions to sounds, or stumbling when walking. These signs typically appear within the first two hours and can persist for over 24 hours. Unlike food poisoning, which mainly affects the gut, THC targets the nervous system—making it harder for your dog to recover without veterinary support.
The danger window for a medium-sized dog
A 12 kg dog eating one standard THC brownie (typically 10-20 mg THC) faces moderate to severe intoxication risk. Smaller dogs show symptoms faster, but even at this weight, expect noticeable impairment. The dog's ability to regulate urine flow often falters, so confine them to easy-clean areas.
Unlike humans, dogs don't metabolize THC efficiently—their symptoms last longer and hit harder. If the brownie was particularly strong or your dog is sensitive, respiratory depression becomes a concern after the 4-hour mark. Keep them away from stairs and monitor breathing patterns closely.
When spoilage symptoms might appear
Food left out overnight grows bacteria that can cause vomiting or diarrhea, but these signs usually emerge later than THC effects—often 8-12 hours post-ingestion. By then, the THC will already be in full effect, potentially masking early spoilage symptoms with more dramatic neurological signs.
Hydration becomes critical if both issues strike simultaneously. A dog sedated by THC may not drink voluntarily, while diarrhea accelerates fluid loss. If you see drooling, retching, or excessive thirst after the first 6 hours, the spoilage factor is likely compounding the THC's impact.
The step-by-step response, from the first minute to the vet visit, is in our Marijuana / THC Poisoning in Dogs emergency guide.