A chest strap having a foaming body, and a reinforcing unit is disposed on one side of the foaming body, and a connecting portion is disposed at each end of the reinforcing unit, and the chest strap further includes a connecting unit. The connecting unit has two connecting straps, wherein one end of the connecting straps is respectively connected to the connecting portions, and each of the connecting straps is further provided with a fastening component, and the fastening components are mutually detachable and assembled. Thereby, the foaming material of the foaming body can be used to improve the comfort of the pet when the chest strap is worn, and the reinforcing unit is used to improve the tensile strength to avoid the force of the foaming body being rushed by the pet. Pulling to produce lengthening and deformation.一種胸背帶，其係具有一發泡本體，且該發泡本體之一側係設有一加強單元，該加強單元之二端係各設有一連接部，同時該胸背帶更包含有一連接單元，該連接單元係具有二連接帶，其中，該等連接帶之一端係分別連接於該等連接部，且該等連接帶上更各設有一扣件，該等扣件係可互為拆裝組接，藉此，可透過該發泡本體之發泡材質來提高寵物穿戴該胸背帶時的舒適度，並藉由該加強單元來提高抗拉性，以避免該發泡本體被寵物暴衝的力量拉扯而產生變長與變形。
