If a dog who has never minded your leaving the house without her suddenly develops separation anxiety when she is older, get her to the doctor. Much of the time, it’s a medical issue that triggers the problem. The dog is in pain for some reason, and she now becomes anxious and insecure in your absence. If the pain interferes with her physical functioning, it can undermine her security all the more. Often, but not always, such a dog had sub-clinical separation anxiety in her younger years that simply was never picked up.
