Option 1- measure the old collar ( if it's the right size) Use a tape to measure from outer edge of the buckle to the hole used.
Option 2- measure the neck size (just like measuring for a shirt) Use a tape measure to measure how you wish the collar to fit around your dog’s neck i.e. with enough room as not to be tight but not too loose that the head slips through. A rough gauge is to allow two fingers to fit easily under the tape whilst measuring.
When you have determined measurement please check which size is required. Note the cm/inches indicate the actual sizes the collar will fasten up at e.g. 32 cm then you will need collar size 27 to 32 cm which is size 3.
COLLAR SIZES ( Approx some styles are Different Please Check the additional info for the collar you are interested in ) Size 1 (1.5cm/1/2") 20-24cm/8"-9.5" Size 2 (2cm/3/4") 22-26cm/8.5"-10" Size 3 (2.5cm/1") 27-32cm/10.5"-12.5" Size 4 (2.5cm/1") 34-38cm/13.5"-15" Size 5 (2.5cm/1") 40-46cm/16"-18" Size 6 (3cm/1.25") 48-54cm/19.5"-23" Size 7 55-65cm/22"-25"
If you are still not sure which size to choose please contact us and we will advise you.