Described is an insulated probe device of adjustable axial length for delivering an electroshock stimulus to an animal. The insulated probe device includes an electrode that is positioned in contact with the animal's skin and is disposed within an electrically non-conductive housing. The housing is a two-part housing, where the two parts cooperate such that the ultimate length of the housing is adjustable. The insulated probe devise includes a mounting device that electrically and mechanically secures the insulated probe device to an electronic animal training device. The mounting device is electrically connected to the electrode by way of a conductor, which is disposed within the housing. The conductor is a metal-rubber substance that conducts electricity like a metal and stretches like rubber such that it is capable of various lengths. Consequently, the ultimate length of the insulated probe device is adjustable.