In truth, Shasta was never the same after Harry died in May. She seemed to miss the companionship, and I don't think that she took too well to being all by herself when Nicky and I were out of the house. Shasta's medical problems simply made things worse, but she was at least holding her own on that front until very recently.
Nicky says that this is the first time in at least 25 years that she hasn't had a dog. We'll certainly get another one at some point in the future, but, for the moment, we need some time to recoup and regroup.