What to expect in the next 2 hours
Metaldehyde's effects accelerate unpredictably—some dogs show seizures within 30 minutes, others seem stable for hours before collapsing. Your terrier's 9 kg weight offers some protection compared to smaller dogs, but the toxin's impact depends on how much bait coating he actually ingested. Early muscle twitches around the muzzle or ears often precede full-body tremors.
Watch for "chewing gum fits"—repetitive jaw motions that signal neurological disruption. These frequently progress to paddling limbs and loss of bladder control. Unlike epileptic seizures, metaldehyde-induced convulsions may last 10+ minutes without natural stopping points.
Why you can't wait for visible symptoms
The toxin continues absorbing even after initial signs appear, making early treatment critical. By the time seizures start, your dog's temperature may already be climbing past 41°C (106°F)—a life-threatening threshold. Vets need to administer anticonvulsants and cooling measures before this cascade begins.
Don't rely on vomiting as a sign the danger has passed—metaldehyde suppresses the gag reflex while still attacking the nervous system. Similarly, a calm period after initial drooling doesn't mean the threat is over; the toxin works in waves.
Emergency transport precautions
If seizures begin during transit, clear the car of objects that could injure thrashing limbs. Lower windows slightly for airflow but avoid drafts that could trigger more tremors. Place a damp towel under his belly to help regulate temperature—never cover him completely, as trapped heat worsens the crisis.
Record the seizure duration and any triggers like loud noises or touch. This helps the vet distinguish metaldehyde poisoning from underlying conditions. Avoid restraining his head during convulsions—tongue swallowing is a myth, and you risk accidental bites.
Longer-term neurological risks
Even after successful treatment, some dogs exhibit "ghost tremors"—subtle muscle twitches that reappear during stress or excitement for weeks afterward. These usually fade but require follow-up if they interfere with eating or walking. Rare cases develop permanent sensitivity to other neurotoxins.
Request bloodwork to check liver enzymes post-recovery. While metaldehyde primarily attacks nerves, secondary organ stress can occur during prolonged seizures. Future preventatives like flea/tick treatments may need adjustment if liver values remain elevated.
For a dose worked out against your pet's weight, use the Slug Bait (Metaldehyde) Toxicity Calculator.