HOW TO FIT A COLLAR TO A HORSE
The illustration shows you how a collar should be fitted. If care is taken in fitting the collar "and in adjusting the hames so hame tug comes over center of draft," you have eliminated all trouble of sore necks and shoulders and the horse will work with ease and comfort. More horses become sore by collars fitted too large than from any other cause.
When fitting a horse with a collar there should not be any more space between the horse's neck and throat of the collar than what will allow your four fingers when laid flat on inside of throat of collar to pass through freely.
HOW TO MEASURE A COLLAR
Place the ruler against the collar cap and measure to the inside of the rim of the throat as illustrated below.
HOW TO MEASURE FOR A HORSE COLLAR
Here is an easy way to measure by using two carpenter squares (see illustration below). Place the top of the "C" in front of the withers and the bottom of the "C" two inches in front of the shoulders. Be sure to allow "finger room" at the base of the throat. Measure the inside of the "C" to obtain the size.