Saw this on a website about organic pest control. Don't know if your dogs might try to eat it though...
"•Use half corn flour and half cement powder mix as bait for the rats. They will eat the mixture and eventually consume water, which will result in a chemical reaction with the cement mix and ultimately lead to their death. The negative of this process is the uncertainty of where the rat has died within a residence."
NOTE:::This is NOT an endorsement of this method. Eventually, you may want to get a really MEAN cat...
My personal favorite is a deer blind and a scoped .22
