English Springer Spaniels - not the "show" kind, but the Field Trial kind. They aren't for the cold weather all day duck/goose hunting, but if you jump shoot, they will work just fine. I even have a pic or 2 of them retrieving a squirrel and a rabbit. 29# ESS bringing back a 13# Canadian too......
I used to hunt along the Colorado River during the opener of Dove season (Sept 1). 115* in the shade, I'd bring more water and other stuff for the dogs than for me.
Ducks, Geese, Doves, Quail, Crows, Rabbits, Squirrels, Pigeons, Chuckar, Pheasant, Starlings, Sparrows. They dont' care what it is, they'll bring back anything!