Any DU families with a pet who has dementia?

[The empressof all]

My 13 year old Lab/Dalmatian mix is beginning to experience symptoms. Last night she began playing the in and out game. She goes through this periodically during the day but only rarely at night. It doesn't have to do with bathroom needs as she doesn't go when she's out. Last night after three outs within a half an hour we tried to settle her in her bed. She just woofed intermittently. One little plaintive woof every few minutes, got up and wandered the house, woofing several times in each room. We called her back to her bed (right next to ours) but she couldn't be persuaded to stay. Finally, SO got up and slept with her on the couch which calmed her down.

I mentioned this to the vet this morning and he suggested we run some tests but that it sounded like onset symptoms that some dogs begin to experience with age. He mentioned medication and nutritional supplements. She already is on a Senior food and gets Arthritis supplements and Omega 3 Oil

Anyone living with older pets? What have you found helpful