Boomer (our dog) also likes to...er..."play" with teh mice in the middle of the night. You can hear a little jingly noise from the collar and there he is grabbing them up in his mouth and throwing them in the air. It's about the funniest thing I've ever seen a dog do . We brush his teeth regularly too, so we don't have to worry abut him getting mouse (or anything else) breath.
All of our placed mice/rat poisons are placed inside the garage on the work bench or in the tool shed on shelves that the dogs cant get to and we DO check them daily to see where they ( or whatever portions are left) have migrated to from the mice eating them. WE have also got some of the STicky traps ( no poison ) to try.
We have NEVER put them n the yard so finding one up in our upper shade patio was quite concerning. WE Will talk with our next door neighbor on this.
With regards to Boomer-- Our little Cairn/Yorkie/monster mix not only likes to Play but he has this habit of finding something disgustingly foul ( snail , dead mouse, etc) and Loves to roll on his back over it - over and over--- smells like the devil or a bad whorehouse in texas ( just kidding) when he comes in -- Bath time for Rusty when that happens...
Cheers
F500