Yes, I am going to make mine with nylon. Here is a link to ordering all sorts of colored nylon:
Omega Nylon Thread Size 2 - Annie's Attic Depending on what size Nylon thread you find, you may have to double strand it. That is what I will be doing, anyway.
I might find time on my trip to crochet one or two, but I have to get some things crocheted to send up to AL & MS where they were hit so hard by the tornadoes. So many lost everything and I am crocheting some dishcloths and small afghans to donate. But it should only take me a few minutes to do a harness, so I will try to slip one in this next week.
This harness is designed to be held together by the leash hook so it is not made to wear without a leash. That is the only time mine would have their harness on, so it was good for me. But modifications would be easy enough to add a buckle in addition to the D-rings.
My name on Ravelry is the same as here FLDebra -- I have not uploaded many pictures there but have tons that I need to put on. I bought a new camera some time back and it takes the small SD cards instead of the CF I used before. For some reason, I cannot seem to download my pictures to my computer from the SD cards! I even bought a separate card reader thinking it was the slot on my computer -- still cannot download them! I don';t know what the problem is. But when I get time I'll take the cards in to get CDs made -- then I can put them on my computer and get them on my Ravelry. (I sort of threw all that info in, in case anyone had experienced something similar and had an idea for me.

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Glad everyone was excited by the pattern as I was. I have lots of others. I will try to post a pet pattern once a week or so. I have other harness & leash patterns, sweaters, toys, even a bed!