Abstract: A back assembly for an animal to bear a doll comprises a first back sheet capable of covering upon a back of an animal; the first back sheet having an first upper combining portion at an upper side thereof; two rear connecting units at two rear ends of the first back sheet; two front straps at two front ends of the first back sheet; each front strap having a front connecting unit at a distal end of the front strap; the front connecting unit being combinable to a respective one of the rear connecting units; a doll having a lower combining portion at a lower side thereof; the lower combining portion being combinable to the first upper combining portion of the first back sheet. The doll is placed upon the first back sheet by the combination of the lower combining portion to the first upper combining portion.