[lukan]

I don't know how it works for rats, but I assume it is like with dogs. If you have already a trained dog, you make the same exercises with the trained and the untrained dog, so the untrained dog can just watch what the trained dog does and imitate it.

[widforss]

That's not how you would typically train a working dog.

[lukan]

I imagine it depends on the work?

I am not an expert here, but am a bit familiar with how rescue dogs are trained and this is a method in use.