I'm associated with a small non-profit animal shelter and we use martingale collars on our shelter dogs for training. Our dogs are color-coded based on behavior and I usually purchase collars from here. Over the last couple of years, our yellow martingale collars have gone missing and/or needed to be replaced. Yellow wasn't available on the website, so I asked if they would ever have yellow available. The answer was, "Yes, they can make them!" So, I special ordered 5 Medium and 5 Large martingale collars and received them less that 2 weeks later. Perfect! Thank you!