She had a heart failure and was suffacating because of fluid around her heart and pooring into her lungs, she opened her mouth straightened her neck and tried to force air,she was also 17 years, when she should live to 12 or 14 years. . . She was a good cat but always a fighter... I miss you cypress and will never forget your many vocies and your tail, which had a mind of its own! flipping and twitching and even flicking up and down, Your always welcome in my heart cypress, but now I must say goodnight little cat :)And im happy your in peace with a tummy full of tuna fish!