I looked up Bromethalin and it does say there can be secondary poisoning if a dog eats the rat. It's just too scary for me to have poison around! Even if the risk is small I just could never forgive myself if one of my other animals got sick.
Seems you have an infestation if you are able to actually see one.
Should you decide trapping is impractical, this link may help on an alternative poison.
http://www2.epa.gov/rodenticides
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