Thinking about getting a new dog down the road (6-12 months). I've always loved big dogs and I'm wondering if anyone has experience with St. Bernards? Are they as friendly as depicted in the movies? Good with kids (mine are older 8+ so they understand that dogs are animals). I'd like to get a puppy from a reputable breeder and train it right. I figure they are pretty active. Would they be ok with the hot summers in California? How much cleaning and grooming do they require? And are there any specific health concerns with them?