A bandana is a triangle of fabric tied or sewn around a dog's neck

A dog bandana is straightforward a square of fabric folded into a triangle and fastened at the back of the neck. You can tie one on with a knot, but sewing it closed creates a finished piece that won't slip or come untied during play. The sewn version stays in place, looks neater, and is safer because there's no loose knot to catch on branches or fencing.

The basic construction takes about 20 minutes once you have your fabric and supplies. You'll fold a square of fabric diagonally, sew two of the three open sides, turn it right-side out, and close the final seam. The finished bandana slips over your dog's head like a collar.

Key Takeaways

  • Start with a square of fabric between 18 and 24 inches on each side, depending on your dog's neck size.
  • Fold the square diagonally to make a triangle, then sew two of the three open edges with a straight stitch.
  • Turn the bandana right-side out through the opening you left, then sew the final edge closed by hand or machine.
  • Measure your dog's neck and add 2 inches to find the right finished size before you cut your fabric.
  • Use cotton fabric, flannel, or quilting cotton—avoid stretchy or slippery materials that are hard to sew.

Measure your dog's neck and choose your fabric size

Measure around your dog's neck with a soft measuring tape, then add 2 inches. That total is the finished length of the bandana's two short sides (the sides that meet at the back of the neck). To find the square size you need to cut, multiply that number by 1.4. For example, if your dog's neck is 12 inches around, you'd add 2 inches to get 14 inches, then multiply by 1.4 to get roughly 20 inches. Cut a 20-inch square of fabric.

Choose a fabric that is straightforward to sew and won't fray badly. Cotton quilting fabric, flannel, or canvas work well. Avoid knit fabrics, stretchy materials, or anything slippery like satin or polyester blends—these are frustrating to sew and don't hold their shape. If you want a reversible bandana, choose two complementary fabrics and sew them together as one piece before you fold and sew the triangle.

Fold the fabric square into a triangle

Lay your fabric square on a flat surface with the right side (the side you want to show) facing down. Fold one corner diagonally to meet the opposite corner, creating a triangle. Press the fold with your hand or an iron to crease it sharply. This crease will be the center back of the bandana, where the two short sides meet at your dog's neck.

You now have a triangle with one folded edge (the long edge that will go around the neck) and two open edges (the short sides that will meet at the back). The folded edge is already finished and won't need sewing.

Sew two sides of the triangle, leaving one open

Set your sewing machine to a straight stitch with a stitch length of 2.5 to 3 millimeters. Use thread that matches your fabric or a neutral color like gray or tan. Pin one of the two open short sides, then sew it with a quarter-inch seam allowance (the distance from the edge of the fabric to your stitch line). Backstitch at the beginning and end to lock the thread.

Sew the second short side the same way. Leave the long open edge (the one opposite the fold) completely unsewn—this is where you'll turn the bandana right-side out. When you're done, you'll have a triangle with two sewn sides and one open side.

Turn the bandana right-side out and close the final seam

Reach through the open edge and grab the folded corner from the inside. Pull gently to turn the bandana right-side out through the opening. Use a blunt tool like a chopstick or the eraser end of a pencil to push the corners out fully so they're sharp and even. Press the bandana flat with an iron or your hand.

Fold the raw edges of the open side inward by about a quarter inch and press them flat. Pin the opening closed. You can now sew it shut by machine using a straight stitch, or close it by hand with a ladder stitch (also called a slip stitch) for an invisible seam. If you use a machine, sew very close to the folded edge. If you sew by hand, use a needle and thread that match your fabric, and make small stitches about an eighth inch apart.

Try the bandana on your dog and adjust the fit

Slip the bandana over your dog's head like a collar. The two short sides should meet at the back of the neck without pulling or gaping. If the fit is too tight, you can carefully cut a small slit in one seam, adjust the size, and resew it. If it's too loose, you can take in the seams slightly by opening one side and resewing with a narrower seam allowance.

Once the fit is right, your dog can wear the bandana during walks, playtime, or photos. Wash it by hand or in a mesh laundry bag on the gentle cycle, and air dry it to keep the fabric and seams in good shape.

Frequently Asked Questions

Can I make a bandana without a sewing machine?

Yes. Sew the seams entirely by hand using a needle and thread. Use a running stitch (in and out, in and out) for the two short sides, then a ladder stitch to close the final edge. It takes longer than machine sewing but works just as well. Make sure your stitches are close together so they don't pull apart during wear.

What if my fabric frays at the edges?

Cotton and flannel fray slightly, which is normal. You can trim loose threads with scissors after washing. If fraying bothers you, explore a thin line of fabric glue or fray-check liquid along the raw edges before you sew, or use pinking shears (scissors with a zigzag blade) to cut the fabric instead of straight scissors.

Can I use fabric scraps or old clothing?

Yes, as long as the fabric is sturdy enough to sew and won't fall apart when washed. Old cotton t-shirts, flannel sheets, or denim work well. Avoid thin or worn fabric that tears easily. If you're using a knit fabric from a t-shirt, stabilize it by fusing a lightweight interfacing to the back before you cut and sew.

How do I make a reversible bandana?

Cut two squares of different fabrics the same size. Place them right sides together, pin, and sew three sides with a quarter-inch seam allowance. Leave one side open. Turn right-side out, press flat, fold the open edges inward, and sew the final seam closed. You'll have a bandana with a different pattern on each side.

Is the bandana safe to leave on my dog all the time?

A sewn bandana is safer than a tied one because there's no knot to catch, but it's still fabric around the neck. Check it regularly to make sure it's not too tight and that the seams aren't rubbing the skin. Remove it during unsupervised outdoor time or if your dog plays in brush or thorny areas where it could snag.