I have three breeds - Boston Terrier, Chihuahua and also rambunctious Boxers in my home. These collars come in various sizes suited for all my breeds. I get the 1” collars for my Boxers, the 3/4” or 5/8” for my Boston Terrier and the smallest size for my chihuahua. I love that these collars are soft and comfy and don’t bother my dogs necks like stiff collars do, yet they are very durable. They’re well made and easy to wash - and another perk is that they don’t retain odors like some of the poly collars do. We’ve had poly collars in the past that stunk so bad no matter how we tried to clean them; I’ve never had any odor problems with these collars and I have rambunctious boxers that like to go swamp diving for frogs in our pond out back. When they get dirty, I just drop the collars in a bucket of soapy water or with Oxy clean and then rinse and dry. Easy peasy. I love the coordinating harnesses too, and the color options make it easy for me to determine whose is whose. The hardware in these are high quality, I’ve been using these for years and have never had any issues. The color vibrancy does tend to fade a wee bit after washing but not a deal breaker for me. Highly recommend.