My MIL has just bought a pedigree golden retriever puppy who is lovely and was given a clean bill of health by the breeder (Kennel Club member). However, on the journey home in the car (about 2 hours) he developed a cough. She took him to her vet who (after a couple of visits) said he had a level 3 heart murmur. Does anyone know anything about this in dogs? Is it possible to develop a murmur in such a short space of time? Is it worth her contacting the breeder to at least get her money back. I don't think she would want to give the puppy back because I think she would be concerned about the level of care he would receive. She thought the breeder seemed great the first time she went to visit but when she went to pick up the dog she spotted that there were actually alot of different breeds being kept (and breeded) and that maybe the lady wasn't quite what she thought
. Any advice is gladly received.