When a measurement is not possible
We make all our collars so we can usually accommodate everyone, even if you can't get a measurement.

There are several factors that can help determine what size you need to order.

If the collar is for a certain individual, then you can probably come up with a rough guess as to what size they need. The average person usually has a neck size of about 15-16 inches. The smallest are about 12", the largest are about 24". so if the person receiving the collar is a little smaller then average but not really small then their neck size would be somewhere around 14 inches. If they're a little on the large side but not real big then its probably going to be about 18-19 inches.

The next thing to consider is the type of fastener you chose.
If you chose a lock hasp or roller buckle, these offer about 4 inches of adjustment.
The laced closure is laced shut so if you order it a little too small it will still fit.