A dog run assembly for preventing tangling of leads includes a pair of bars, a pair of lines, a pair of connectors, and a pair of fasteners. Each line is engaged to and extends between the bars. Each connector is rotationally engaged to a respective bar and can engage a respective vertical support element of a pair of vertical support elements so that the pair of lines is suspended between the vertical support elements. Each fastener is slidably engaged to a respective line so that the fastener is slidable between the bars. The fastener can engage a respective lead attached to an associated animal. The pair of bars rotates as a pair of animals tethered singly to the lines travel in opposing directions relative to the pair of lines. The lines and the leads attached to the animals remain untangled.