1/2" wide in sizes 10, 12 & 14.
Size 10 will fit a dog with a 6" to 7-1/2" neck.
Size 12 will fit a dog with a 7-1/2" to 9-1/2"neck.
Size 14 will fit a dog with a 9-1/2" to 11-1/2 neck.
3/4" wide in sizes 16, 18 & 20.
Size 16 will fit a dog with a 10" to 12" neck.
Size 18 will fit a dog with a 12" to 14" neck.
Size 20 will fit a dog with a 14" to 16" neck.
1" wide in size 22, 24 & 26.
Size 22 will fit a dog with a 15" to 18" neck.
Size 24 will fit a dog with a 17" to 20" neck.
Size 26 will fit a dog with a 19" to 22" neck.
For correct collar size, please measure your dogs neck.