Kim,
I like to shoot Danes low to show off their height and I shoot them 3/4 from the front. For a Specialty, I like to use a backdrop and studio lights if I'm inside; nice flowers behind the sign if I'm outside and there I use on-camera flash.

Shoot RAW and if you get a Black Dane, make sure to open up one stop. For Harls, I close down 1/2 stop.

Good luck.

Jim