Hi! The biggest problem with „No“is that we (not you, we‘ve all done it!
) expect the dog to understand immediately what it actually means. Punishment is totally contra productive because they can‘t understand what they‘re actually being punished for and that just results in confusion, frustration and distrust in the handler. The best way of telling at dog that you don’t want it to do whatever it‘s doing is to show it what you do what it to do, - i.e. an alternative behaviour. You can call the dog to you but if its found something incredibly exciting in the hole it‘s digging you need to offer something more exciting as an alternative (I say exciting at this stage as at 11 weeks its too much to expect impulse/self control, you need to start with distraction).
Keeping the focus on you is the key at this stage, treats can be used to a point but a game, a tug, intactive play is better. Try as much as you can to be a step ahead and start to offer the distraction before she gets too focused on something else.
Grabbing by the scruff of the neck is, thank heavens, totally out of date and achieves very little other than a dog who may eventually seem disciplined but is infact only reacting out of fear. Cockers in particular are very sensitive, and being heavy handed can destroy the results of weeks of training in just one go. Learning to ignore the behaviour we don’t want but rewarding the behaviour we do can sometimes be a challenge but believe me, its the best way forward.
Your girl is still a baby and she needs to explore, discover the world around her and gain confidence, which doesn’t mean she‘s allowed to do everything she wants but she‘ll learn that by doing certain things will get her rewards and other things, like digging holes won‘t !!!
The base line is, that most dogs WANT to please and do the right thing, cockers thrive on praise, they just need to learn what pleasing you means!
Best of Luck!