A guide (1, 101, 201) of a saw blade for double and triple pelvic osteotomies in dogs comprising a guiding element (10, 110, 210) whose body (5, 105, 205) has a shape of a solid fitting into a cuboid and which has a longitudinal through hole or a slit (20, 120, 220) having a width c not greater than 3,0 mm and a length b smaller than a longitudinal dimension of the body (5, 105, 205) of the guiding element (10, 110, 210), whereby the through hole or slit (20, 120, 220) is perpendicular to a bottom wall or surface (11, 111, 211) of the guiding element (10, 110, 210) and which has a set of at least three through mounting holes (31, 32, 33) with a diameter not greater than 3,0 mm whose outlets (41, 42, 43) are located within the bottom wall or surface of the guiding element (10, 110, 210), two of which are situated on one side of the longitudinal through hole or slit (20, 120) and at least one is situated on an opposite side of a longitudinal axis of symmetry of the through hole or slit (20, 120) in relation to a side on which the two through mounting holes are located, whereas orthogonal projections (52, 53) of the outlets (42, 43) of most distanced through mounting holes (32, 33) from each other and situated on one side of the longitudinal through hole or slit on the longitudinal axis of symmetry of the through hole or slit are located between opposite walls of the through hole or slit characterised in that the guide has a slider (6, 206) and in the body (105, 205) of the guiding element (110, 210) there is a transverse through hole perpendicular to the longitudinal axis of symmetry of the longitudinal through hole (120, 220) with a cross-sectional shape and dimensions corresponding to a shape and dimensions of a cross-sectional profile of the slider (6, 206) and the slider (6, 206) is movably positioned within the transverse through hole and has a stabilizing hole (65, 265) nearby its free end and has a locking screw and in the body (105, 205) of the guiding element (110, 210) there is a threaded hole that runs from an upper wall or surface (115, 215) of the guiding element (110, 210) to at least the transverse through hole and in which a locking screw is screwed in. whose body (5, 105, 205) has a shape of a solid fitting into a cuboid and which has a longitudinal through hole or a slit (20, 120, 220) having a width c not greater than 3,0 mm and a length b smaller than a longitudinal dimension of the body (5, 105, 205) of the guiding element (10, 110, 210), whereby the through hole or slit (20, 120, 220) is perpendicular to a bottom wall or surface (11, 111, 211) of the guiding element (10, 110, 210) and which has a set of at least three through mounting holes (31, 32, 33) with a diameter not greater than 3,0 mm whose outlets (41, 42, 43) are located within the bottom wall or surface of the guiding element (10, 110, 210), two of which are situated on one side of the longitudinal through hole or slit (20, 120) and at least one is situated on an opposite side of a longitudinal axis of symmetry of the through hole or slit (20, 120) in relation to a side on which the two through mounting holes are located, whereas orthogonal projections (52, 53) of the outlets (42, 43) of most distanced through mounting holes (32, 33) from each other and situated on one side of the longitudinal through hole or slit on the longitudinal axis of symmetry of the through hole or slit are located between opposite walls of the through hole or slit characterised in that the guide has a slider (6, 206) and in the body (105, 205) of the guiding element (110, 210) there is a transverse through hole perpendicular to the longitudinal axis of symmetry of the longitudinal through hole (120, 220) with a cross-sectional shape and dimensions corresponding to a shape and dimensions of a cross-sectional profile of the slider (6, 206) and the slider (6, 206) is movably positioned within the transverse through hole and has a stabilizing hole (65, 265) nearby its free end and has a locking screw and in the body (105, 205) of the guiding element (110, 210) there is a threaded hole that runs from an upper wall or surface (115, 215) of the guiding element (110, 210) to at least the transverse through hole and in which a locking screw is screwed in.