MrsL, What size dogs are you looking for in your end result? Weight and height.
Well, my Stags are between 28" and 30" at the shoulder. Crossing in the other breeds of course I'm likely to lose some height. I'd at least like them to average the same height as a standard sized Catahoula would be, for comparison. Weight isn't as important to me so long as they have enough arse behind them to anchor down.