My 11-yr-old spayed Chihuahua ha been diagnosed with an enlarged heart and has been on lasix for several months. She coughs terribly. Prescribed suppressants seemed ineffective. Robitussin DM has been suggested and tried temporarily, also mostly ineffective. Can you suggest anything else that could ease the coughing? Her appetite and elimination are good and she is active. The coughing seems to be less a bother to her than to me.
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