At a dog trial, what does GTG stand for?

In the context of a dog trial, "GTG" stands for "Go To Ground." This term specifically refers to the practice of a dog pursuing game that has taken refuge underground, typically in a den or burrow. In Jack Russell Terrier field trials, this action is a critical component of a dog's working ability, showcasing the breed's instinct and skills in hunting scenarios.

When a dog is commanded to "Go To Ground," it indicates that the handler is allowing or directing the dog to search for and engage with the game that is hiding in its natural underground habitat. This demonstrates not only the dog's drive and determination but also its training in following scent and understanding the environment in which it operates.

The other options do not accurately reflect the specific terminology used in dog trials, particularly for terriers, where the action of going underground is a fundamental aspect of the event.