Our rescue lurcher is 10+ years old, he's always had poor vision (currently treated for high pressure in his eyes) and his hearing is going.
He follows me around the house barking. It's often playful, though the energy can get frantic and bossy.
He has little interest in toys, chews, bones, antlers, Kong etc.
He loves his LikiMat and he likes it when I hide treats in the garden, that occupies him for a while. It's as though he needs to be walking, sleeping, eating or barking, there's no happy busy or playful activity to occupy him in between.
He used to be exercised off-lead, which we had to stop because his recall has suffered, but even lots of running on the long lead doesn't reduce the barking, it's sometimes worse when he comes home tired after a long walk.
I've made a vet appointment and will contact the behaviourist we've used in the past for follow up but I wondered if anyone here had any thoughts.