My Dog Ate Slug Bait (Metaldehyde Poisoning): What to Do

How Dangerous Is Slug Bait for Dogs?

Very. If your dog ate slug or snail bait that contains metaldehyde, treat it as a life-threatening emergency and head to the nearest open veterinary hospital right now — do not wait to see whether symptoms appear. Metaldehyde is one of the deadliest garden poisons for dogs. Signs can begin within minutes and, left untreated, the poisoning can kill within hours from uncontrollable tremors, dangerously high body temperature, and seizures [1].

The single most important thing to check is the active ingredient on the package. Older and cheaper slug pellets typically contain metaldehyde, which is the dangerous one. Newer, "pet-safer" baits often use iron phosphate (ferric phosphate) instead, which is far less toxic [2]. Grab the box or bag and bring it with you — the ingredient name changes everything about how urgent this is and how your vet will treat it.

If you cannot reach a vet immediately, call Pet Poison Helpline at (855) 764-7661 or the ASPCA Animal Poison Control Center at (888) 426-4435 on the way. But calling is a supplement to — not a substitute for — getting to an emergency room.

What Metaldehyde Does to a Dog's Body

Metaldehyde is a neurotoxin: its main target is the central nervous system [3]. Within a short time of being swallowed it overexcites the nervous system, which is why the hallmark signs are muscle tremors and seizures. As the muscles fire uncontrollably, the body generates enormous heat, and the dog's temperature can climb to dangerous levels — a state that can exceed 41–42°C (106–107°F) [3].

Because tremors and overheating dominate the picture, veterinary toxicologists nickname metaldehyde poisoning "shake and bake" — the "shake" being the severe tremors and seizures, the "bake" being the alarming rise in body temperature [2]. That overheating is not a minor side effect; sustained hyperthermia can damage organs and is one of the ways this poisoning becomes fatal.

There is no antidote for metaldehyde. Treatment is entirely about stopping the tremors, cooling the body, and supporting the dog until the toxin clears — which is exactly why professional emergency care matters so much.

How Much Slug Bait Is Toxic to a Dog?

Metaldehyde is dangerous in surprisingly small amounts. The reported oral lethal dose in dogs is around 100 mg/kg, and severe effects can occur at much lower doses than that [4]. Some veterinary sources report a wider lethal-dose range of roughly 210–600 mg/kg, but the key takeaway is the same: it does not take much [3].

Residential slug and snail baits in the U.S. typically contain 2% to 4% metaldehyde, and commercial products can go higher [3]. Because pellets are often mixed with bran or molasses to attract slugs, they can also smell appealing to dogs, which is how accidental poisonings happen. There is no "safe" nibble to wait out — the amount that harms a small dog can be very little, so any suspected ingestion warrants an immediate vet visit regardless of how much you think was eaten.

Symptoms of Metaldehyde Poisoning

Signs come on fast — often within a few minutes to about three hours of ingestion [2], and sometimes up to six hours [3]. Early signs can look like general agitation and stomach upset before the neurological signs take over [2]. Watch for:

• Severe muscle tremors and twitching — the most recognizable sign
• Restlessness, anxiety, or hypersensitivity to touch and sound
• Drooling (hypersalivation), vomiting, and diarrhea
• Wobbly, uncoordinated walking (ataxia) or an unsteady gait
• Rapid heart rate (tachycardia) and panting
• A dangerously high body temperature (hyperthermia) — the dog may feel hot to the touch
• Seizures, which can become continuous, and collapse

In one veterinary case series, the most commonly recorded signs were convulsions, tremors, hypersalivation, vomiting, and incoordination [4]. If untreated, the neurological signs progress to severe fever and death [1]. These symptoms can escalate very quickly, so do not "watch and wait" at home.

What to Do Right Now

Speed matters more than anything else here. Take these steps:

1. Move your dog away from the bait and safely gather any remaining product and its packaging.
2. Go to the nearest open veterinary hospital immediately. Call ahead if you can so the team is ready.
3. Bring the package (or a clear photo of the ingredient panel) so the vet can confirm whether it is metaldehyde or a safer ingredient like iron phosphate [2].
4. Do NOT try to make your dog vomit at home unless a veterinarian or poison-control expert specifically tells you to. Inducing vomiting in a dog that is already tremoring or seizing can cause choking and is dangerous.
5. Call a poison control line on the way if possible — Pet Poison Helpline at (855) 764-7661 or the ASPCA APCC at (888) 426-4435 — to get case-specific guidance for your vet.

Every minute counts. Getting to professional care before severe tremors and overheating set in gives your dog the best chance.

Treatment and Prognosis

There is no antidote, so veterinary treatment focuses on decontamination, controlling the tremors and seizures, cooling the body, and supportive care [3].

If the dog is stable, the vet may decontaminate the gut — inducing vomiting and giving activated charcoal to bind toxin that hasn't been absorbed yet [3]. To stop the muscle activity, vets use a muscle relaxant such as methocarbamol and anticonvulsants such as diazepam given intravenously to effect [3]. Because overheating is so dangerous, the team will actively cool the dog using measures such as cool intravenous fluids, fans, and cooling of the paw pads and ears [3]. Intravenous fluids also support circulation and help protect the kidneys, and dogs often need close monitoring in hospital.

The prognosis depends heavily on how quickly treatment starts. With early care, many pets recover fully within about two to three days [2]. In veterinary terms, dogs that survive the first 24 hours generally have a good outlook, though some need several days of hospitalization and a few weeks to fully bounce back [3]. The flip side is the sobering part: metaldehyde poisoning can be fatal, especially when treatment is delayed — which is the whole reason to move immediately rather than wait.

How to Prevent Slug Bait Poisoning

The most reliable prevention is to stop using metaldehyde products where pets have access. A few practical steps:

• Read the label and choose iron-phosphate (ferric phosphate) baits instead of metaldehyde — they are considered much safer for pets [2]. Even so, store and apply them out of your dog's reach, since large amounts of any bait can still upset the stomach.
• Store all pellets in sealed containers on a high shelf or in a locked cabinet, in their original packaging so you always know the ingredient.
• Never scatter loose pellets across open lawn or beds your dog can roam; follow the product's application instructions closely.
• Supervise garden access after any pest treatment, and check the yard for spilled product.
• Keep the packaging for anything you do use — if the worst happens, that label helps your vet act fast.

When to See a Vet

Metaldehyde poisoning is a true emergency. Go to the nearest open veterinary hospital or emergency clinic immediately if:

• You saw or suspect your dog ate slug or snail bait, even if it seems fine right now — do not wait for symptoms.
• Your dog develops muscle tremors, twitching, a wobbly gait, or restlessness/anxiety after being in the yard or garden.
• Your dog has a seizure, collapses, or feels hot to the touch / is panting heavily (signs of dangerous overheating).
• You are unsure of the product's ingredients — treat it as metaldehyde until proven otherwise and get seen right away.

Frequently Asked Questions

References