I was told to use a brand called Tomcat. Place the specified dose in a Mason jar with a V-shaped notch cut in the lid. Set on a slightly raised portion of soil so water drains away from the opening. ( Voles will not eat wet bait.) Cover with a milk crate to prevent the jar being disturbed or eaten by a pet. The friends who told me of this method have two dogs and the most beautiful hosts and no voles, except for the random stray vole, who doesn'T live long.
