I really think it's counterproductive to subject an already anxious dog to Bitter Apple and force her to remain in her crate with a smell designed to put her off for eight hours. I would get a Wizdog, so she cannot shred her pee pad, and think about another way to contain her - perhaps a bathroom or safe room with no carpet on the floor. However, if she truly has separation anxiety she may be destructive of doorways or other things if she can reach them, so try her in the new location when you can be in and out to observe. Most true SA dogs don't get any real relief from a stuffed Kong - that's because in the first twenty minutes you are gone they are too anxious to eat, and by the time they are relaxed enough, if they ever are, they have already shredded whatever they are going to shred. Also, your dog is NOT being stubborn or willful - just anxious or bored. Chewing and shredding are a dog's way of releasing that tension and making themselves feel better. She may get some benefit out of you doing the training and desensitization techniques in Patricia McConnell's book "I'll Be Home Soon". If it's boredom, then puzzle toys, more exercise, music or tv on, and lots of training while you are home (clicker training provides great mental exercise for dogs, which serves to tire them out, too, and relieve boredom).
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"If you talk to the animals they will talk with you and you will know each other. If you do not talk to them you will not know them and what you do not know, you will fear. What one fears, one destroys." - Chief Dan George
"The fidelity of a dog is a precious gift demanding no less binding moral responsibilities than the friendship of a human being. The bond with a true dog is as lasting as the ties of this earth can ever be." ~ Konrad Lorenz