Current methods for catching and dispatching rat’s mice and other pests are indiscriminate.
Snap traps are generally non-selective and non-target species can be killed/injured.
Glue boards (recently banned by the Scottish Government) provide an exceedingly painful demise as animals struggle for days before they die of exhaustion, dehydration and famine.
Toxic poisons death using anti-coagulant rodenticide as far as we know causes the animals to become very lethargic and as they have ‘human’ instincts they don’t go outside to die. This is perhaps the reason why on so many websites we read of clients from hotels and other establishments calling for help to find odious carcasses that are decaying inside their walls, attics, service hatches, and basements.
We do know that anticoagulants in poisons lead to disruption of the vitamin K cycle, resulting in inability of production of essential blood-clotting factors. Toxic doses of anticoagulants cause damage to tiny blood vessels (capillaries), increasing their permeability, causing diffuse internal bleedings (hemorrhaging). The effects are gradual and they develop in course of several days but they are not accompanied by any nociceptive perceptions, such as pain or agony. In final phase of the intoxication, the animal collapses in shock or severe anemia and dies.