When my cat Tiger died she left an unbearable ache in my heart. Animals do this. They hold joy and love and solace in a way humans can’t, and then they die. But after she died, I heard her. I was sitting at my desk and the sounds of her nails tap-tapping down the wood floor of the hall came to my ears, and only when I turned to look for her did I remember that she was gone. Sometimes I felt her presence, like her