If your dog measures 36 cm or smaller it's recommended smaller beads 15 mm beads or smaller but that can depend on the taste. 

Measurement:

Always round up to the nearest measurement when choosing a size.

See more info on the size guide page.

Slip-on:

The measurement you request will be the full inner circumference length + some extra space so that the collar can slip over the head.

Snap-on/Martingale chain/ Martingale hex:

Snap-on: The measurement you request will be the full inner circumference length of the collar.

Martingale:
The measurement you request will be the full inner circumference length of the collar when contracted.

Buckle: The measurement you request will be the full inner circumference length of the collar.

Tips if you don't know what to choose:

Slip-on:

This dog collar gives more of a "necklace" look. This type of collar is to be used both as a tag collar or as a regular collar. (Keep in mind that it's a slip-on collar and that the collar can slip off depending on the dog if used as a regular walking collar). Perfect for hanging ID/tags

Snap-on, martingale:

See more info on the size guide page.