Last legs

Poor Maisie, this photo doesn't really show but I fear she is on her last legs - refusing to eat for the past few days and just drinking water. She is skin and bone (and fur of course). She isn't old - about 12 - but has a heart condition. Last time I took her to the vet she suggested I have her put to sleep but she doesn't seem to be in pain and does have good days. Sad times.