Hi everyone, I have an 8 year old female Shih tzu and just recently she occassiionally faints. This has happened about 4 or 5 times over the last month and each event lasts about 5 to 10 seconds and then she just returns to normal. She is completely fit and ok in every other way. When she faints she is just still, no twitching etc. and she goes a week or more without any problem. We have been to the vet and they gave her an ECG for her heart which showed no problems and now they have suggested it might be a breathing problem but she runs about having fun without struggling to breath. My question is has anyone experienced anything similar with their dog ?