A pet head cover includes a pillow with a closed loop and a beam unit. The beam unit includes a bundle of mouth portions, a pull cord and a cord buckle, the bundle mouth portion has a closed loop shape, and an outer edge of the bundle mouth portion is oppositely connected with an inner edge of the pillow, and the bundle mouth portion The inner edge defines a through hole, and the inner surface of the beam mouth portion defines a threading passage, the cable is disposed in the threading passage and the rope buckle and is partially exposed to the beam mouth portion, and the rope buckle can be The pull cord is releasably held and used to adjust the length of the drawstring in the stringing passage, thereby adjusting the size of the through hole.一種寵物頭套包含一呈封閉環狀之枕具及一束口單元。該束口單元包括一束口部、一拉繩及一繩扣，該束口部呈封閉環狀，且該束口部的外緣與該枕具的內緣相對連接，且該束口部的內緣界定出一通孔，且該束口部的內表面界定出一穿繩通道，該拉繩穿設於該穿繩通道及該繩扣且局部外露於該束口部，該繩扣可釋放地固持該拉繩並用於調整該拉繩位於該穿繩通道內的長度，進而調整該通孔的大小。
