We have a 15 year old Shi Tzu. She has poor eye sight and hearing, but otherwise is in reasonably good health for her age. Within the last year or so she has gone through several periods lasting a week or so where she starts barking in her cage at about 6:00 in the morning. We have tried to ignore her thinking she would stop but this doesn't work. We get her out of her cage and all is well. She isn't hungry or thirsty, and doesn't seem to need to go outside to do her business. She just wants out of her cage! For 14 years she slept peacefully in her cage each night. Help!! Any suggestions?