To provide a diaper for a pet which can reliably store feces in a bag irrespective of the hardness of the feces, by widening it even when the feces bag is flattened even when defecated, and a fecal bag for it I will provide a.SOLUTION: The diaper main body is provided with a hip abutting portion side hole 14 where the tail hole and the feces excretion hole are communicated with the buttock covering portion 11 covering the buttocks of the pet D, and the diaper main body having the separating impossible outside the buttocking portion 11 Or the detachable attachment opening portion 16 which faces the buttock portion side hole 14 is formed at the bag inner sheet or the upper end of the bag and the tail opening portion 18 is formed in the bag outer side sheet 20. The pet diaper 10 is in contact with the upper surface of the base portion f of the tail T of the pet D in the upper edge forming portion of the tail hole in the hap bearing portion 11, And a fixing plate piece 29 to which the upper part is fixed is connected so as to be movable integrally with the root part f of the tail T.BACKGROUND OF THE INVENTION【課題】排便直前に大便袋が扁平状態でも、排便時、ペット自身でこれを広げて、便の硬さに拘わらず、確実に大便を袋内に収容できるペット用オムツおよびそれ用の大便袋を提供する。【解決手段】ペットDの臀部を被う臀当て部11に、尻尾穴と大便排泄穴とが連通する臀当て部側穴14が形成されたオムツ本体と、臀当て部11の外側に分離不能または着脱自在に装着されるとともに、臀当て部側穴14と向かい合う尾便兼用開口部16が袋内側シートまたは袋上端に形成され、かつ尻尾用開口部18が袋外側シートに形成された大便袋20とを備えたペット用オムツ10であって、臀当て部11のうちの尻尾穴の上縁形成部に、ペットDの尻尾Tの根元部fの上面に当接され、かつ袋外側シートの上部が固定される固定用板片29が、尻尾Tの根元部fと一体的に移動可能に連結したものである。【選択図】図1
