A pet transporter comprising a window structure; the window structure comprising a panel body comprising a plurality of through holes disposed proximal to a selected portion of the panel body, and a plurality of first attachment portions provided around the periphery of the panel body; wherein the plurality of first attachment portions are arranged and configured to concord with a plurality of second attachment portions provided around a periphery of an opening of a box body of the pet transporter, wherein the first attachment portions are provided on upper and lower sides of the panel body, and wherein the corresponding second attachment portions are positioned about the opening of the box body to concord with the positions of the first attachment portions; wherein the panel body comprises a stop piece disposed at a right or left side of the panel body, wherein the stop piece is sized and shaped to be received through the opening and abut against an edge thereof; the pet transporter characterised in that: the box body comprises a positioning protrusion positioned about the opening, and the panel body comprises a positioning hole disposed at an opposite right or left side to the stop piece, wherein the positioning hole is sized and shaped to receive the positioning protrusion therein, and the positioning hole co-operates with the positioning protrusion to effect releasable securement of the window structure to the pet transporter, wherein co-operation of the stop piece and the positioning hole forms an anti-retraction mechanism to minimise lateral movement of the window structure when fixed to the pet transporter; and wherein, in use, each of the first and second attachment portions co-operate to form an attachment mechanism to effect releasable securement of the window structure to the pet transporter, and the plurality of through holes co-operate with the opening allow light and air to be transmitted in and out of the pet transporter. the window structure comprising a panel body comprising a plurality of through holes disposed proximal to a selected portion of the panel body, and a plurality of first attachment portions provided around the periphery of the panel body; wherein the plurality of first attachment portions are arranged and configured to concord with a plurality of second attachment portions provided around a periphery of an opening of a box body of the pet transporter, wherein the first attachment portions are provided on upper and lower sides of the panel body, and wherein the corresponding second attachment portions are positioned about the opening of the box body to concord with the positions of the first attachment portions; wherein the panel body comprises a stop piece disposed at a right or left side of the panel body, wherein the stop piece is sized and shaped to be received through the opening and abut against an edge thereof; the pet transporter characterised in that: the box body comprises a positioning protrusion positioned about the opening, and the panel body comprises a positioning hole disposed at an opposite right or left side to the stop piece, wherein the positioning hole is sized and shaped to receive the positioning protrusion therein, and the positioning hole co-operates with the positioning protrusion to effect releasable securement of the window structure to the pet transporter, wherein co-operation of the stop piece and the positioning hole forms an anti-retraction mechanism to minimise lateral movement of the window structure when fixed to the pet transporter; and wherein, in use, each of the first and second attachment portions co-operate to form an attachment mechanism to effect releasable securement of the window structure to the pet transporter, and the plurality of through holes co-operate with the opening allow light and air to be transmitted in and out of the pet transporter. the box body comprises a positioning protrusion positioned about the opening, and the panel body comprises a positioning hole disposed at an opposite right or left side to the stop piece, wherein the positioning hole is sized and shaped to receive the positioning protrusion therein, and the positioning hole co-operates with the positioning protrusion to effect releasable securement of the window structure to the pet transporter, wherein co-operation of the stop piece and the positioning hole forms an anti-retraction mechanism to minimise lateral movement of the window structure when fixed to the pet transporter; and wherein, in use, each of the first and second attachment portions co-operate to form an attachment mechanism to effect releasable securement of the window structure to the pet transporter, and the plurality of through holes co-operate with the opening allow light and air to be transmitted in and out of the pet transporter.