Are there any dogs that can be left for 7 hours max, 3 days a week?

We've looked at having a Cavalier KC spaniel which we would love to have, although I'm concerned they would not want to be left alone for too long. My wife would leave home at 8:30 returning at 15:30 I would be able to work from home one day a week and so could my wife,the entire family would be home all weekend. Can anyone help? our main concern is naturally the dog's welfare. Thank you.