1. Take a sheet of paper having a diamond shape, fold the top and bottom corners of the dotted lines.
2. Bend shape in half along a diagonal line illustrated in phantom.
3. Fold the top corners on the dotted lines, to go beyond the corners of the sheet border.
4. A small portion of the upper corners to bend backward (you can stick with glue, so as not to fold it back).
5. "muzzle" is ready. To get the resemblance to muzzle dogs, you need to draw the eyes, nose, mustache, and mouth.