Small Size : wide 1/2inch (1.5CM) length 12inch (30CM) ,for neck 8-10.5inch Medium Size :wide 1/2inch (1.5CM) length 15inch (38CM) ,for neck 10.5-13inch Package include 1PCS Dog Collars
How to measure
To find your dog's size, simply measure around their neck with a flexible tape measure or string, leaving it comfortably loose. Dog collars should be snug with enough room to fit two fingers under the collar, Collars should also not be so tight they restrict breathing or cause coughing. We recommended add 1 inch to your measure.
How to choose the size
1. add 1" on your measure, for example: the measure is 18", then you should choose 19"(18"+1"adjustment)
2. look at our size will fit for your dog
Another method to measure the correct collar size is to measure an existing collar that is already sized to your dogs'neck