Cat Meodling???

[feral1]

For whatever reason my 15 year old cat has started to do this super LOUD gutteral, low pitched meow/yodeling thing, especially at night? Not sure what her deal is but as soon as I go look at her she seems fine. I can't tell that she is hurting. Only thing is I have noticed she seems to be breathing heavier? She is snoring really loud these days? Anyone else have this happen?

You might want to get her blood checked. My cat (16 yrs) is hyperthyroid and does that meowing everynight...........sometimes ALL night.......