What is the diameter of a go-to-ground tunnel?

The diameter of a go-to-ground tunnel for Jack Russell Terriers is specifically designed to accommodate the breed's size and movement capabilities. A 9-inch diameter is considered the standard because it allows enough space for the dog to navigate through without being too large, which might diminish the tunnel's purpose in simulating the burrowing behavior of the terrier. This size ensures that the tunnel is suitable for tests involving underground work, allowing the dogs to demonstrate their instincts effectively.

Tunnels of different diameters might not provide the appropriate challenge or safety for the terriers, as larger tunnels could lead to a lack of motivation to navigate through them. Thus, a 9-inch diameter is optimal for testing the intrinsic skills of Jack Russell Terriers in go-to-ground scenarios.