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Hi there, I'm sorry to hear about your dog's distress. Does she have a history of congestive heart failure or an enlarged heart? If so, is she on any medication for these conditions?
If she is not coughing, may I ask what makes you concerned about congestive heart failure specifically?
Constant panting is not typically a sign of congestive heart failure. Coughing is, as is respiratory distress, discoloration of the gums, lethargy, and inappetence. Panting can be caused by endocrine disorders such as cushion's disease, hypothyroidism or things like pain and discomfort, anxiety, overheating, etc. Drinking lots of water can also signal an several things such as kidney disease, diabetes, liver disease, cushings disease or other metabolic abnormalities. Without further information, I think that a veterinary exam and blood work is in order, unless there have been changes to the environment such as a warmer environment, added stress, etc to explain the excess panting. Based on what you have told me, however, I would not be concerned about congestive heart failure.