On Sept 20th my 18 year old,Ellie, passed away. My 16 year old began to howl and look around for Ellie. Her behavior was definitely out of sorts. It was suggested that we get another cat for the 16 year old because she has never lived solitary and see if that would help her. Last week we introduced a second cat and the howling stopped and she was just unusually quiet. Nov 1st she was breathing funny and I took her to the vet and she was in cardiac distress and passed away, too. Is it possible that the loss of her companion was too much for her to continue on and the stress of the new addition as well? I am lost without them both and trying to make some sense of this to get through it. Any input would help.