2 continuous yards of webbing
1 swivel clip
Plus either a needle and thread or if you have it a sewing machine to make it even easier. Although the sewing machine isn't really needed because there is very little sewing involved. This will make a standard 5 foot leash that you could find in any pet store.
I bought my supplies from this website: http://www.craftersvision.com/
Step 1: Step one
Now you're all done! Wasn't that super easy? Wow 2 steps and you have a new dog leash in any color you want and for less then $5.