Mouse & Rat Control for Canadian Homes — Trap-First & PMRA-Legal

Second-generation anticoagulants (brodifacoum, bromadiolone, difethialone) are no longer sold as domestic-class products in Canada — after Health Canada's rodenticide re-evaluation they are restricted to licensed commercial and agricultural use. The main PMRA-registered consumer option is a non-anticoagulant bait such as bromethalin, sold pre-loaded inside tamper-resistant disposable bait stations (the Tomcat disposable line is the most widely stocked example). Loose pellets and the high-potency concentrates you see on US sites are not a legal consumer purchase here. Our rat poison legality guide covers exactly what is and is not on the shelf.

For a household mouse problem, traps are almost always the better first move. A snap or electronic trap gives you a confirmed kill you can see and remove, works the same night you set it, and carries no risk of a poisoned mouse dying inside a wall and stinking for weeks. Bait also creates a secondary-poisoning risk for pets, owls, and hawks that eat a dosed rodent. Reserve bait stations for situations where trapping alone cannot keep up, and even then choose the legal, tamper-resistant, pre-loaded format.

Three reasons: confirmation, safety, and Canadian law. Traps let you confirm each catch and gauge whether the problem is shrinking; bait leaves you guessing. Traps avoid the secondary-poisoning risk that bait poses to pets and predatory birds. And because Canada restricts the strongest rodenticides to commercial applicators, the consumer poison options are narrower than most US advice assumes — so a trap-first strategy is both safer and more practical for a homeowner working with what is legally available.

The evidence says no. Controlled studies have repeatedly failed to show that ultrasonic plug-in devices drive mice or rats out of a home, and the US FTC has taken action against manufacturers over unsupported claims. Rodents habituate to the sound quickly and simply nest around it. The devices are legal to sell in Canada because they contain no pesticide, but legal is not the same as effective. Spend the money on traps, sealing gaps, and removing food sources instead.

When outdoor temperatures drop, mice look for warmth, food, and shelter — and a house is all three. An adult house mouse can squeeze through a gap the width of a pencil (about 6 mm), so the common entry points are gaps around dryer vents, utility and cable penetrations, garage door corners, weep holes, and the base of exterior doors. Fall is the highest-value time to seal those openings, which is exactly why the winter-exclusion guide in this cluster focuses on stopping mice before they get in rather than trapping them after.

No. Diatomaceous earth is a mechanical insecticide dust — it works by abrading the waxy coating of crawling insects so they dehydrate. It does nothing to mammals like mice or rats. We include the diatomaceous earth buyers guide in this cluster only as a related crawling-insect reference, not as a rodent product. For mice, the effective tools are traps, exclusion, and (as a last resort) legally registered bait stations.

No. BuzzSkito is a mosquito and tick control service operating in the GTA — those are the only two pests we treat. We do not do rodent removal, and we do not sell or apply any of the products reviewed here. This cluster is independent research from our publishing team, focused on what is genuinely available and PMRA-legal for Canadian homeowners. If a rodent infestation is beyond DIY, a licensed pest control operator is the right call.