[header] How to give atenolol to cats with heart disease [title] Notice heart disease symptoms. [step] In many instances cats will not show signs of heart disease until it has become severe. If you notice your cat struggling to breathe or their mobility suddenly becomes restricted, they may be suffering from heart disease. 
If these symptoms occur, you should visit your vet immediately. Other symptoms of heart disease in cats include : [substeps] Lethargy loss of appetite blue gums or tongue collapse or sudden death [title] Visit your veterinarian.