Is my dog going senile?

It started after we left the house for 3 hours, usually she wants us to pet her stomach and then gos away but she was acting like we went on vacation for a week. Last night she got out of bed and started barking at a wall, there was no noise at all. And finally today she is pacing and carrying a stuffed dog in her mouth, and just now she hid the stuffed dog. She's a Lhasa Apso and she's only ten years old. Is she going senile?