Start with width because it determines the proportion, weight, and visual impact your dog will carry.
A 15mm dog chain collar is the lightest option. It is best suited to dogs under roughly 15kg or finer-necked breeds such as Whippets, Greyhounds, and smaller Staffies. It delivers the gold chain look without placing a heavy piece across the chest.
A 25mm dog chain collar sits in the middle. It is bold enough to stand out but balanced enough for comfortable, all-day wear across most medium and large dog breeds.
A 32mm dog chain collar is the statement option. It is designed for large-framed dogs such as Bull Terriers, Mastiffs, American Bullies, and German Shepherds with thicker necks that can comfortably carry the heavier gauge.