An anti-biting mask for dogs is disclosed. The body includes a main body installed symmetrically in front and back, and a muzzle is installed symmetrically up and down on the left side of the main body, and a chamber opened to the right relative and right is installed in the muzzle. A left vent hole is communicated with the left side of the chamber, and a holding plate is symmetrically installed on the upper and lower sides of the main body, and a telescopic device is installed in the main body. A tightness adjustment device is installed on the right side of the device, a control device is installed outside the expansion device, the expansion device includes an expansion chamber installed in the main body, and in the expansion chamber, The elevating plate is installed so as to be symmetrical and slidable up and down, a compression spring is fixedly connected between the elevating plates, and the left and right ends of the elevating plate are symmetrical and fixedly connected to the telescopic bar. , One end of the telescopic rod is fixed to the sandwiching plate It has been consolidated. [Selection diagram] Fig. 1
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