My 13 year old chihuahua has been diagnosed with a Grade 3 heart murmur (coughing quite often). I would rather not treat him with the conventional heart drugs, as I understand that these can cause longterm liver damage, and may or may not be that helpful in the first place. Are there any herbal supplements that you recommend I give him, and if so, what sort of dosages/tinctures/pills do you suggest? Also, do you recommend bottled water versus tap water? Thank you in advance for your assistance.

