A pet diaper is equipped with a front surface layer, a back surface layer, and an absorbent layer disposed between the front surface layer and the back surface layer. The pet diaper has a back portion, an abdominal portion, and a crotch portion disposed between the back portion and the abdominal portion. The pet diaper is further equipped with: a first cut portion that is provided on the back portion and that is formed as a convex curve rounding towards the end portion of the back portion； a second cut portion that is provided closer to the crotch portion than the first cut portion and that is formed as a convex curve rounding towards the end portion of the back portion； and a first perforated portion that is formed so as to extend from the second cut portion towards the first cut portion.本發明，係提供對應寵物性別而配裝於適當位置之寵物用紙尿布。本發明，係具備表面層(2)、背面層(3)、及配設於表面層(2)與背面層(3)之間之吸收層(4)，並具有背抵部(A)、腹抵部(C)、及配置於背抵部(A)與腹抵部(C)之間之胯抵部(B)的寵物用紙尿布(1)，更具備：配設於背抵部(A)並朝背抵部(A)之端部側凸出而彎曲形成的第1切入部(110)、配設於比第1切入部(110)更靠胯抵部(B)側並朝背抵部(A)之端部側凸出而彎曲形成的第2切入部(120)、以及從第2切入部(120)朝第1切入部(110)延伸形成之第1易切開部(130)。
