Rat poison can certainly be very dangerous to domestic animals who eat the dead rats.
Rat poisons come in 3 varieties:
1) Anticoagulant rodenticides
2) Cholecalciferol rodenticides
3) Bromethalin rodenticides
In the past there have been various other types of rat poison, however, these 3 varieties are generally what are used today. The first type, anticoagulant rodenticide, works by thinning the blood. The second type, cholecaliferol rodenticide, works by disrupting the rat's ability to process calcium. The third, bromethalin rodenticide, works by reducing the rat's ability to control muscle contraction.
[FONT=Verdana, Arial, sans-serif]The type I am referring to is the anti-coagulant type. The amount of poison required to kill a rat should not harm a dog 20 times its weight. i ensure that my free range dogs do not have access to the poison concentrate by putting it in special housings but I have no control over how many rats they chose to eat. I have not lost a dog to poisoning.[/FONT]
[FONT=Verdana, Arial, sans-serif]The other types of poisons can be lethal to dogs if they eat the rats.[/FONT]
2) Cholecalciferol rodenticides is a Vit D overdose--not toxic if the rats are eaten by Dogs, Slightly toxic to cats. It is registered for use in Organic operations. I have one called Agrid3. It works for coagulant resistant rats.
Sadly the rats here won't eat it....