IRISH WOLFHOUNDS!
I don't know what it is, but this breed is just to die for. I plan on having one when I get my own place.

I also like Tollers, Goldens (the ones with the big thick light colored coat), Bernese Mt. Dogs, St. Bernards, Wirehaired Pointing Griffons, Afghans, Salukis, Borzois... anything big and hairy!