What command can help a dog remain in a fixed position?

The command that is most effective for helping a dog remain in a fixed position is "Stay." This command instructs the dog to remain in the specific spot where it is at the moment the command is given, encouraging self-control and patience. Training a dog to respond to "Stay" is fundamental because it establishes a clear boundary of where the dog is allowed to move and how long it should remain in place. This command is particularly useful in various situations, such as during obedience training, while waiting for the owner to return, or when it’s important to keep the dog away from distractions or hazards.

While other commands like "Come" and "Heel" help facilitate movement and control during walks or interactions, they do not serve the purpose of keeping the dog stationary. "Fetch" also encourages movement and retrieving an object, which is the opposite of maintaining a fixed position. Thus, "Stay" is clearly the best command for that specific function.