I never read through all the way through this part of the forum, it makes me cry after three posts!! I have read much of the literature, as a precaution, but I can only read a few pages at a time. Purhaps I haven't gotten to it yet... but I have a question: Do other breeds get SM or is it mainly a cavalier thing? Does it tend to run in small breeds or is it not size specific? Are the symptoms the same?