First, I determined the lowest level of stimulation, or nick, necessary to get Pritch's attention. My unit has 7 levels, from ½ to 6. I started with ½, and Pritch was oblivious. Same result with level 1. At level 2 I noticed her lick her lips and give a slight shrug of the head, as if a bug had buzzed by her ear. That's all I was looking for. You want to get the dog's attention, not juice her.