My 7 year old tortie Middy has lost her meow. Yesterday she had a normal meow but today it is a bit raspy. Usually when I would go to pet her she would meow really loud now you can barely hear it. What could this be? I am not able to take her to the vet til Friday, maybe she will be better by then but I will probably still take her. Any ideas of why she has lost her meow? Thanks.