I don't want to worry you any more than you are..but that sounds so much like Mercedes did. The vet said it was the first stages of dementia. She would whine when there was nothing wrong, walk around like she was totally lost...and go nuts sometimes like she thought I was gone. She lost her hearing those last few months so if she wasn't right where she could see me she would think I had left her. She was 16 years old. All this happened that last year...it was very sad when there was just nothing I could do for her. We decided to ease her pain (she also had arthritis and cataracts and huge tumors on her sides) and send her on over to RB one year ago this month..

Just keep an eye out on those strange behaviors and ask your vet if that could be it. There is nothing they can do for it, but at least you would know and help by giving extra comfort and let her know you are there..loving on Mercedes was about the only thing that settled her down..