The invention relates to a dog excrement collector that comprises a hollow handle (9) which contains a bag (12) that is fixed with a clip (11) to the shaft (1) which is solidly connected to the frame (16) by clip (25). A rod (2) that moves inside the shaft (1) by means of a pull element (3) which slides in a slot (5) and which is screwed to the rod (2) at point A. The mentioned rod (2) is linked to another rod (17) by a clip (24) and is used to move the second rod (17) forwards and backwards along the arms (18 and 20) of the frame (16) as far as a side element (19). The space inside the rectangle formed by the sides (17, 18, 19, 20) contains the bag (26) which is fitted to small T-shaped hooks with round heads (22), for opening and closing (27).