Bromethelin has been tested and shown not to be toxic to dogs that subsequently ate a rat that died of a lethal dose of bromethelin poison. Here's the study URL:
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1023&context=vpc10
Try using rat poison containing Bromethelin. It's a neuro toxin that kills rats with a single feeding. Most rat poisons are hemmorragic that cause death by internal bleeding and require multiple ingestions to work. Additionally, rats build up an immunity to hemmorragic poisons. Read the...