To make a homemade dog muzzle, use any long strip of material that you can find like ribbon, used pantyhose or rope. From the dog's nose, loop it under the chin and tie into a knot. Gather both ends of the material behind the ears then tie into a bow. To know about dog muzzles go to http://www.ask.com/wiki/Muzzle_(device)?qsrc=3044#Dog_muzzles.
If it is a emergency, you can grab a shoe lace, small leash, or fabric and make a slip knot. Wrap the end a couple time around the muzzle toward the back not near the nose. Tie the end in a bow behind the dogs head. Do not tie a knot. You want to be able to get it off quickly.