as evidenced by the lack of difference in movement before finding the treat between groups. Therefore, it is probable that the dogs in the experimental group did indeed use the mirror to locate the food. The ability to use a mirror as a problem-solving tool has not previously been demonstrated in this species (but see Howell & Bennett 2011 for potential evidence of such a skill), and our results therefore add further information to the growing body of knowledge about the general problem-solving abilities of domestic dogs.