Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
My fear for your sweet Puddy is that there may be a medical condition causing this drastic change in behavior. it may be that Puddy has become frightened by something causing this obsessive behavior and the only way to change this is to follow these instructions:
They develop fears that cause extreme anxiety similar to those anxieties of humans. The only way to get her over this is "Desensitization" which means constant exposure until Puddy realizes that these fears will not hurt her. To do this, first avoid these while making your dog comfortable in his situation. You may need help in doing this since when you try, as you have experienced, she is too afraid to understand. Purchase a DAP Collar at the pet store. This is a canine pheromone that acts as a calming agent and will decrease anxiety.
Thundershirts are useful since this is one of the most common fears causing extreme anxiety and can be very effective.
If this is not enough, your vet will have medication to help her past this. Take Puddy to your vet for an exam to be sure there is not a medical cause for this and ask about anti anxiety medication such as Fluoxetine or Buspirone. Then expose her to the things she fears over and over, constantly talking in a soft voice and giving treats when he does something positive. Here is a site with more tips:http://www.petplace.com/dogs/fear-of-thunder-sounds-or-noises/page1.aspx
Because of Puddy's age, this could be more serious so have your vet check her.
Does that make sense to you?
Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please REPLY so I can clarify for you.
Sincerely, ***** *****