Supplies:
One 12-1/2" fabric square. Make sure you pay attention to how you cut your square if your fabric is directional.
One 12-1/2" square of lightweight fusible interfacing (really only needed if you have a very hairy beast)
Directions:
-Iron interfacing to bandanna fabric.
-Fold two corners in; 3 inches on each side.
-Topsitch at folds.
-Iron in half, matching points. Sew from bottom of folded in corner to the bottom of the one on the other side.
-Turn right side out and topsitch around bandanna being sure to leave the collar pocket open. Sew across to create your collar pocket. (Measure your dog's collar width first)
-Slip their collar through and put it on your pooch!
To make for smaller dogs, follow the same steps but you'll need to play with different sized squares until you find the perfect size for your dog.