Hi there, I haven't posted on this site for such a long time. Just to recap, Maddy came to me as a stray in Oct 2007 & was thought to be between 2 & 4 years old. She is truly the perfect dog & we love her so much (as do our 2 cats). She had a dental in March & was deemed to be in good health, however, I took her to the vet for her booster jab last week & she the vet said she now had a heart murmur & was about grade 3 (I gather grade 6 is the highest?) Vet has given me a spray to put on her food (Cardiguard) & I have to take her back in 3 months just to monitor her. Should I be worried? Maddy is not a lively dog at the best of times - laid back I think you could call her - but the vet has told me to look out for changes like coughing & off her food etc... I just want her to have the best life possible & just don't know what to expect. Judy.