These are the tools that I use when I braid paracord. You will need 2 hemostat clamps, a C-clamp, scissors, a flexible measuring tape and a small woodburning tool. You can commonly find the woodburning tool at most crafting stores. The brand that I use is a Lenk. Of course, you will need a snap that is size appropriate to your dog and the paracord, ofcourse.
Paracord will shrink when it gets wet so you must preshrink it so that your finished project won't get all misshapen the first time you take your dog for a walk in the rain. To preshrink the paracord, soak it in hot water for a few minutes and then lay it on a flat surface to dry. I usually preshrink a bunch at a time to that I always have plenty on hand when I need it.
I am making a 5 foot leash, with a 5 inch allowance for the handle, so to determine how much paracord that you need, break down the length of your project into inches and multiply by four. 65" X 4 = 260" so I will need 2 seperate paracord strands that are EACH 260" long.