A guide of a saw blade for double and triple pelvic osteotomies in dogs comprising a guiding element whose body has a shape of a solid fitting into a cuboid and which has a longitudinal through hole or a slit having a width c not greater than 3,0 mm and a length b smaller than a longitudinal dimension of the body of the guiding element , whereby the through hole or slit is perpendicular to a bottom wall or surface of the guiding element and which has a set of at least three through mounting holes with a diameter not greater than 3,0 mm whose outlets are located within the bottom wall or surface of the guiding element , two of which are situated on one side of the longitudinal through hole or slit and at least one is situated on an opposite side of a longitudinal axis of symmetry of the through hole or slit in relation to a side on which the two through mounting holes are located, whereas orthogonal projections of the outlets of most distanced through mounting holes 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 and in the body of the guiding element there is a transverse through hole perpendicular to the longitudinal axis of symmetry of the longitudinal through hole with a cross-sectional shape and dimensions corresponding to a shape and dimensions of a cross-sectional profile of the slider and the slider is movably positioned within the transverse through hole and has a stabilizing hole nearby its free end and has a locking screw and in the body of the guiding element there is a threaded hole that runs from an upper wall or surface of the guiding element to at least the transverse through hole and in which a locking screw is screwed in. whose body has a shape of a solid fitting into a cuboid and which has a longitudinal through hole or a slit having a width c not greater than 3,0 mm and a length b smaller than a longitudinal dimension of the body of the guiding element , whereby the through hole or slit is perpendicular to a bottom wall or surface of the guiding element and which has a set of at least three through mounting holes with a diameter not greater than 3,0 mm whose outlets are located within the bottom wall or surface of the guiding element , two of which are situated on one side of the longitudinal through hole or slit and at least one is situated on an opposite side of a longitudinal axis of symmetry of the through hole or slit in relation to a side on which the two through mounting holes are located, whereas orthogonal projections of the outlets of most distanced through mounting holes 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 and in the body of the guiding element there is a transverse through hole perpendicular to the longitudinal axis of symmetry of the longitudinal through hole with a cross-sectional shape and dimensions corresponding to a shape and dimensions of a cross-sectional profile of the slider and the slider is movably positioned within the transverse through hole and has a stabilizing hole nearby its free end and has a locking screw and in the body of the guiding element there is a threaded hole that runs from an upper wall or surface of the guiding element to at least the transverse through hole and in which a locking screw is screwed in. <EOS>