Seizure risk starts within the hour
Metaldehyde acts fast, and your dog's size doesn't change that timeline. Even if they only licked the bait, the first muscle tremors can appear before you finish reading this. Watch for twitching eyelids, drooling, or unsteadiness—these often hit before full convulsions. The packaging matters because some baits contain 3% metaldehyde while others reach 7%, changing how quickly symptoms escalate.
Don't wait for visible signs if ingestion just happened. At the clinic, they'll likely use IV fluids to protect the kidneys and anti-seizure meds if needed. Cooling measures help too—overheating worsens the toxicity. If your dog's already panting heavily or seems disoriented, cover them with a damp towel during transport.
Why the bait form changes everything
Pellets or liquid baits concentrate metaldehyde where dogs can't resist licking it. Unlike garden sprays that dilute the toxin, bait products stick to their mouths. Your dog may have ingested more than you think—check for blue-green stains on their lips or paws. Those granules also break down slowly, sometimes causing secondary poisoning if they vomit later.
Vets see worse cases when owners assume "just a nibble" is harmless. Metaldehyde doesn't follow dose rules like chocolate or grapes—tiny amounts can trigger neurological effects in sensitive dogs. Even if your dog seems fine after 30 minutes, their blood levels might still be rising.
The critical first three hours
If it's been under an hour since ingestion, the vet may still prevent seizures. Time matters more than quantity here. They'll check temperature first—metaldehyde sends body temps skyrocketing, which alone can be deadly. Blood tests help but take too long initially; treatment starts on symptoms and history.
Some dogs collapse suddenly without earlier tremors, especially active breeds. Keep movement minimal—excitement speeds toxin absorption. If you're more than 20 minutes from a clinic, call ahead so they prepare the crash cart. Recovery isn't linear either—dogs often seem better after fluids, then relapse hours later.
What emergency vets do differently
General practices might not stock the muscle relaxants needed for severe metaldehyde cases. Emergency clinics monitor heart rhythms continuously because this toxin disrupts electrical signals. They'll also flush the stomach under anesthesia if ingestion was recent, which is safer than inducing vomiting at home.
Expect at least 12 hours of observation—some dogs seizure days later from liver-processed toxins. The packaging helps vets predict this delayed risk. If your dog has ever had heatstroke or reactions to flea meds, mention it—those histories increase metaldehyde sensitivity.
For a dose worked out against your pet's weight, use the Slug Bait (Metaldehyde) Toxicity Calculator.