Are slug pellets dangerous to dogs?

Metaldehyde, the active ingredient in older slug pellet formulations, is genuinely dangerous in small quantities and acts quickly, sometimes within 30 minutes to an hour of ingestion. This combination of high toxicity and fast onset makes it one of the more urgent garden chemical exposures a dog owner can face, well beyond the risk level of most toxic plants.

Restlessness, twitching, tremors, an elevated body temperature, and seizures can all appear rapidly after metaldehyde ingestion, and this is a situation where speed genuinely matters. If you see your dog eating pellets, or find an open or disturbed container after the fact, treat it as an emergency and contact a vet immediately rather than waiting to observe symptoms first.

Ferric phosphate based slug pellets, widely sold as pet and wildlife friendly, break down into substances far less toxic if eaten in normal gardening quantities, making them a sensible substitute for any garden a dog has access to. Physical barriers like copper tape, and encouraging natural predators such as birds and hedgehogs, further reduce reliance on chemical control altogether.

Whichever product you use, store it in a sealed container out of a dog's reach, and apply it according to package directions rather than scattering visible piles a dog might investigate. Check product packaging carefully, since not every product marketed for slugs clearly states which active ingredient it uses.