Why vomiting changes the timeline
When a 10 kg dog starts vomiting six hours post-ingestion, it means his stomach rejected some toxins but others already entered his bloodstream. The high-fat content triggers pancreas inflammation, compounding the selenium poisoning. Yellow vomit suggests bile backup from system overload.
Three nuts deliver a selenium dose that overwhelms his liver's processing capacity. Unlike one-time vomiting from eating grass, this will persist without anti-nausea medication—dehydration becomes the next concern.
The vet's two-phase approach
Bloodwork checks three things: selenium levels (peaking 6-12 hours after ingestion), liver enzyme spikes, and pancreatic values. They'll compare these to baseline hydration status—a dog vomiting this long often needs subcutaneous or IV fluids even if he drank water.
Treatment focuses on symptom management, not antidotes. Injectable antiemetics like maropitant calm the stomach, while gastrointestinal protectants coat irritated linings. Some clinics use selenium-binding agents, but these work best within the first hour.
The critical 48-hour window
Most dogs show improvement within a day of fluids and medication, but relapses happen if the pancreas stays inflamed. Your vet may recommend hospitalization for continuous monitoring—a single vomiting episode post-treatment warrants another blood check.
At home, offer ice chips before water to prevent gulping. The prescribed bland diet (boiled chicken/rice or hydrolyzed kibble) must continue for 5-7 days—regular food too soon risks restarting pancreatitis.
Long-term effects to monitor
Severe selenium toxicity can cause lingering muscle weakness or nerve damage. Note any unusual fatigue during walks or hesitation jumping onto furniture in the weeks after recovery. These warrant follow-up blood tests.
Dogs who survive selenium poisoning often develop food aversions—if he sniffs then avoids treats he previously loved, try different textures. The memory of nausea links strongly to certain smells.
The full verdict, portion guidance and serving notes are collected on the Brazil nuts food facts page.