If you really want to test your skills as a trainer/handler, get the mini-dachshund! My 15 mo. male is fully ob trained, ccd, ffd....and thinks he's a lab. Marks, casts, and retrieves are great, as far as water work---he'd rather send the lab! Somewhat vocal on the line, patience is not his virtue!
As far as a truck dog goes his manners are impeccable and always earns his timbits at Tim Hortons!!!(Coffee shop) Don't be afraid to drill the obedience early-these guys are pretty clever!