I've been thinking and have pretty much set my mind on getting a cavalier after I graduate school next year and I would appreciate hearing some personal experiences, both good and bad, about owning this breed (like what kind of temperament, how's the health in your cav's, do yours bark a lot, can you leave him/her alone while you work, etc). Also how severe is this chasing instinct I keep reading about? Can you keep your dog off leash at all? The heart problem in particular worried me to the point where I almost decided another race would be best but I figure as long as I buy from a good reputable breeder it'll be fine. I'll be doing a ton of research in that area before I decide from who I'll buy.