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Hello I am Dr RB.. I am sorry to hear this.. Do you have a 24 hour emergency hospital or vet school teaching hospital near you? That would probably be best to see if they can stabilize him.. Congestive heart failure can lead to a period of decompensation so his medications may need to be adjusted.. If you aren't able to get him to an emergency clinic, he may pass away through the night... I would keep him calm and quiet in a warm place and let him know you are near by.. I am sorry he is feeling poorly..older dogs are such a blessing.