I have a shetland sheep dog, he is coming up on 12 years old. He has a really bad hip, so we have to carry him around when he goes to the bathroom and such. Recently, he is following me around, and never use to go in the these locations. He now sits under like a coffee table and such. At night, he keeps barking, until i come downstairs. All night he will keep barking until i come downstairs. Its hard to get a good night sleep. Any idea why he is all of a sudden following me around, and barking when i leave?