This happened to Nougat and I couldn't figure out what on earth was going on. The day after I noticed she wasn't making any noise, I noticed that she sounded as though she was gagging a lot. There were no other symptoms. It turned out that she had the calicivirus (one virus that causes cat colds) and it had given her a very sore throat. It's a bad virus that causes mouth ulcers as well as laryngitis and it is very, very contagious. If it goes to the eyes, it can cause the cat to lose an eye. Let's hope there is another reason for Ashley's losing her voice.