Hi i had mice about six months ago i really didnt want to but i put poison down but withinn a week they had gone and havnt been back since i am always on the look out for there return but i think as long as we keep pets such as piggies and buns we are prone to mice i bought my poison from sainsburys it was about £ 3 and i put it in the airing cupboard at the back so there is no chance the dog can get to it hope this helps good luck 88)