I had a cat that threw up in my suitcase when I'd pack for a trip. I had to start hiding it from him.

They can and do feel loneliness. They can also feel sad and grieve death. After my grandmother passed away, her cat, that she had since her birth and was 17 when she passed, was constantly searching for her, whining for her, she stopped eating and drinking, and eventually got to the point where she was so malnourished that the only humane option was to have her put down. Another example is my own cat, Fienchetto. We had to put down his sister, Muffin, just a few months ago due to kidney failure. We are all heart broken of course, and so is he. They were so close that they were almost always together, playing, eating and drinking together, cuddled up with each other, and gave each other baths. He is always looking for her all over the house, meowing for her to come and play, and now he won't eat or drink unless someone is with him. My cats have been able to perceive when I am upset or sad, and have comforted me numerous times. They have wiped the tears from my eyes, snuggled up and purred by my face, and have even just laid on my stomach facing me and put their paw on my cheek as though they were telling me everything was going to be fine, just like a friend would do. Cats are very sensitive perceptive animals.

Cats miss the stuff the owner gave them, not that owner. Just because you've seen what looks like loneliness in cats, doesn't mean it actually is loneliness.

My cat, Athena, used to wait at the end of the driveway for me to come home from school. My mum was in, my brother often got back before i did. She wasn't waiting for them, she was waiting for me. We had four cats at one point, her sister Sabbath, who we'd had for the same amount of time and who we treated in the same way, spent most of her time with my mother. Cats have their favourite people just like people have their favourite cats.

My one of my cats does that, he somehow even knows when I'm in a different car, he comes right up to the door and waits for attention.

Calling police was my first thought. Having constant music on that disturbs the neighbours while she's away definitely sounds like a breach of peace to me. You can't kick the door in but I'm sure the police can. Or they'll just contact the landlord and get some keys. (*******.)

Yup, and so do the neighbors.