People often say “where should I get my supplies?” And then there’s a flurry of responses, not always with links, and, somehow, folks still end up ordering from Amazon and often get something they can’t (or shouldn’t) use. So, in no particular order, here are all the suppliers I know of with websites (you’re on your own with Etsy). The links are to the websites, in general, and not an endorsement or recommendation of a particular product.
The K9 Nose
A great article on good Odor Hygiene practices, especially nice for beginners
Dr. Chris Zinc with general observations about harnesses