A toy for promoting natural instincts, in particular scent, curiosity and the intelligence of dogs, comprising a body, into which small-sized, tasty, edible rewards for the dog, so-called treats can be introduced, wherein - a hollow prism body formed with panels and having a substantially triangular, trapezoidal or cylindrical segment-shaped cross section is arranged on a flat base panel, lateral panels (21, 23) and an apex panel or lateral panel sections (21', 22', 23') of said cross section which rise obliquely from the base panel being designed in each case with at least one aperture (5, 50) which passes through same and below which there is a support surface spaced apart therefrom or such a base on which a food reward or "treat" which is valued and can be reached by the dog can be placed, that - the prism body is delimited on both sides by vertical, mutually parallel flank panels which project beyond the lateral panels or lateral panel sections thereof with consistently constant protrusion height, the mutually facing protrusion inner surfaces of said flank panels each being provided with a guide channel following at least substantially the course of the outer surface of the lateral panels or of the lateral panel sections, into which two guide channels a plurality of rods, bars or rollers are arranged so as to each project therein with the two end regions thereof, longitudinally abut one another and thus substantially covert least one of the lateral panels (21, 23) or apex panel or lateral panel sections (21', 22', 23') and thus the at least one aperture (5, 50) present there, and can be moved, in particular slid, individually or together onto or over the lateral panels (23, 21) or lateral panel section (23', 21') on the other side, beyond the lateral panel forming the apex of the prism body, i.e. beyond the apex panel or the apex panel section, by the dog smelling the food reward so as to expose the at least one aperture and the food reward disposed therebelow and thus accessible. - a hollow prism body formed with panels and having a substantially triangular, trapezoidal or cylindrical segment-shaped cross section is arranged on a flat base panel, lateral panels (21, 23) and an apex panel or lateral panel sections (21', 22', 23') of said cross section which rise obliquely from the base panel being designed in each case with at least one aperture (5, 50) which passes through same and below which there is a support surface spaced apart therefrom or such a base on which a food reward or "treat" which is valued and can be reached by the dog can be placed, that - the prism body is delimited on both sides by vertical, mutually parallel flank panels which project beyond the lateral panels or lateral panel sections thereof with consistently constant protrusion height, the mutually facing protrusion inner surfaces of said flank panels each being provided with a guide channel following at least substantially the course of the outer surface of the lateral panels or of the lateral panel sections, into which two guide channels a plurality of rods, bars or rollers are arranged so as to each project therein with the two end regions thereof, longitudinally abut one another and thus substantially covert least one of the lateral panels (21, 23) or apex panel or lateral panel sections (21', 22', 23') and thus the at least one aperture (5, 50) present there, and can be moved, in particular slid, individually or together onto or over the lateral panels (23, 21) or lateral panel section (23', 21') on the other side, beyond the lateral panel forming the apex of the prism body, i.e. beyond the apex panel or the apex panel section, by the dog smelling the food reward so as to expose the at least one aperture and the food reward disposed therebelow and thus accessible.