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I do not recommend using a crate as a source of correction or punishment. Your elderly dog will eventually have enough. What is happening is you keep intervening and your protecting your elderly dog , which is making the pup be even more consistent. Your creating a weakness with your elder dog. It’s annoying you, but your not the issue. The pup and the older girl is. Let the older dog reach the point where she has had enough. This is a puppy, not a dog that is going to cause harm to your older dog. She may be more patient or some dogs show leadership by ignoring the pups behavior. Let it play out. Be patient
