Just, my thoughts from seeing others, cross breeding, to get specific traits. You will be lucky to get one out of the litter that will have the traits you are looking for. It will take months, to years to figure out which pup has those traits. Are you willing and able to put in the time and money to feed, and work with the pups to find this out.
"That is the plan... brains, agility and a strong nose and lacking fear... around 40-45 pounds."
From what I have seen and read to, quickly, get what you are looking for you need a Blackmouth Cur sire.
