The present invention provides an absorptive article for animals, which is not easily detached from the animal body and may be firmly adapted with the animals' crotch to prevent the excrement from leaking. The absorptive article for animals (1) of the present invention comprises: an auxiliary body (2) that can be freely worn around the animal's body including back and belly and an absorptive body (3) disposed along the back, crotch and belly of the animal and detachably worn and fastened on the auxiliary body (2). Viewing from the plane under a developed state, the absorptive body (3) comprises: an engaging portion (38) disposed at least one end of two ends along the longitudinal direction, an absorptive body (33), a tail opening portion (39), and an elastic member (36) for applying longitudinal contraction force onto the absorptive body (3). Moreover, the elastic member (36) is disposed on two outer sides in the width direction of the absorptive body (33) and at least has a longer length in the longitudinal direction than the length of the absorptive body (33) in the longitudinal direction.本發明是為了提供一種動物用吸收性物品，其不容易從動物身體脫離，可確實地配適於動物的胯下部，而能防止排泄物的漏出。本發明的動物用吸收性物品(1)係具備：沿著動物之包含背部及腹部之胴部周圍而被穿戴成可裝卸自如的輔助體部(2)、及沿著前述動物之背部、胯下部及腹部配置且可裝卸自如地卡合固定於前述輔助體部(2)之吸收本體部(3)；該吸收本體部(3)在展開狀態的平面視下，係具備：配置在位於長度方向的兩端之各端部當中至少一方的端部之卡合部(38)、吸收體(33)、尾巴用開口部(39)、以及用於對吸收本體部(3)賦予長度方向的收縮力之彈性構件(36)，再者，該彈性構件(36)係配置在吸收體(33)之前述寬度方向的兩外側，且具有至少比吸收體(33)之長度方向長度更長的長度方向長度。
