A dog excrement automatic reception assembly, an excrement device and an excrement bag are provided. The dog excrement automatic reception assembly is capable of being worn on a dog, at least comprising one excrement device and one excrement bag. The excrement device comprises a cushion main body, a curtain and several connection bands. The cushion main body comprises a through hole and a connecting part that is covered by the curtain. One end of the curtain is connectively fixed on one side of the connecting part of the cushion main body, and the other end of the curtain is a free end that is capable of arbitrarily swinging and fixedly connected with a magnetic stripe. A magnetic plate is fixed on a site of the connecting part of the cushion main body relative to the magnetic stripe. The excrement bag capable of being folded in a flat laminated form is assembled on the connecting part of the cushion main body. With the gravity force of the magnetic stripe connected to the curtain which is greater than the magnetic attraction force thereof, the folded laminated excrement bag is limited between the cushion main body and the curtain via the magnetic attraction force from the curtain and therefore is unable to be unfolded. Besides, the dog wearing the dog excrement automatic reception assembly still can normally move and remain its attractive figure without sudden change in appearance. When the dog defecates, the summation of a thrust force produced from the excrement weight and the gravity force of the magnetic stripe is greater than the magnetic attraction force of the magnetic stripe, and therefore the curtain is forcedly pushed off and the excrement bag can be naturally dropped, thereby precisely entering the dog excrement into the excrement bag for storage.本創作係提供一種狗便自動承接總成、便器、便袋，其係至少包括一便器、一便袋，其係供穿戴在狗的身上，該便器係包括一墊本體、一遮幕、數連結帶，該墊本體係具一通孔及一結合部，該結合部並受一遮幕所覆蓋，該遮幕之一端係結合固定於墊本體之結合部之一側邊，另一端係呈自由端而可任意擺動，其自由端係結合固定一磁條，而墊本體之結合部相對於磁條處則固定有一磁吸片，該便袋係可折疊成扁平之疊層狀而組設在結合部，本創作藉結合於遮幕上之一磁條之磁吸力
