Tell me a bit about this breed----my husband said he has always wanted one (I'm not sure if he REALLY means it...but...) anyway. How difficult are they to train? Can they be left alone during the day? How much exercise do they require? I'm aware of the drool factor, and shedding issues. Oh--and how much do they generally eat? LOL--I am not put off by their size, but want to be sure we could accomodate all that a St. needs. Thanks in advance!