Are Dobermans Outdoor/indoor pets ?

We have a gotten a nice large insulated Dog with under heating pad . I would like to buy a Red/rust doberman , the dog will be kept unchained tethered in my fenced in Big yard . We have a big shade tree where i plan to put a kiddie pool . Are dobermans good outdoor dogs ? The dog will be let in in the blazing heat of summer only . We do spend alot of time outdoors on our Deck . I think this would be a great place for a Outdoor dog . And we can plug up a Big fan in our outdoor work room where the dog will be let in also .