What does the term "spanning" refer to in the context of Jack Russell Terriers?

The term "spanning" in the context of Jack Russell Terriers specifically refers to the practice of measuring around the dog's chest using hands. This measurement is taken with the dog standing upright, and it helps assess the dog's conformation by ensuring that its body structure falls within the breed standards. Proper spanning indicates a healthy and well-proportioned chest, which is important for the overall balance and agility of the dog.

This practice is relevant for handlers and breeders who strive to uphold the breed's standards, as it provides a clear metric for evaluating and comparing the physical attributes of Jack Russell Terriers. Understanding spanning can guide training and breeding decisions to promote desirable traits within the breed.