I'm pretty paranoid, so I don't think I would ever leave a dog outside all day, but that is just me. I don't think there is anything wrong with it, per se.

I have a foster dog right now who was surrendered by her owner because he left her out all day and she was destroying the fence and getting loose. She is a very high drive dog and there wasn't enough to stimulate her. She has scars all over her nose from the fence. She is a wonderful dog and we now keep her crated inside during the day and she is doing great! She just sleeps all day and we play with her outside when we get home. For her, crating was a much better option and she is happier and safer than leaving her out. Your dogs might not be like that at all, of course, but I would observe them and see what they will tolerate. My foster's owner has another dog, same breed (german shepherd) who had no issues being out all day and even when she escaped he would not follow. It depends on the dog.

Also, one thing I would worry about (and I am curious what other people think) is them getting their collars stuck on something and strangling themselves. But of course, you would want a collar on them so they have id if they got loose. Do you guys that leave your dogs out use quick release collars?

See, I told you I am paranoid.

Good luck with your new babies!