The invention relates to a novel toy for sharpening the instincts of dogs, wherein - a hollow prism body (20) of trapezoidal cross section is arranged on a base panel (10) and has its lateral-surface panels (21, 22, 23), which rise up obliquely from the base panel (10), formed with at least one aperture (5), which passes through said lateral-surface panels and beneath which it is possible to place a reachable food reward (9), wherein - the prism body (20) is delimited on either side by vertical flank panels (3), which project beyond the lateral-surface panels of the prism body at a constant projection height (h) throughout and of which the inner projection surfaces (310) are each equipped with a guide channel (35), which follows the course taken by the outer surface of the lateral-surface panels, the two guide channels (35) having arranged in them a plurality of longitudinally mutually abutting rollers (6) which each have their two end regions (61) projecting into the guide channels, cover one of the lateral-
