From my experience with the various "doodle" breeds I've encountered, they are timid and very scared. I would not expect them to handle farm life. Farm life is not for the doggy faint of heart and the coat of the doodles, not conducive as well. Having owned English Mastiffs, I would rule those out as well. Have you considered looking at Australian Cattle dog? We have one and she is good with my chickens, cats, goat and horses. A good farm dog too. Good luck in your search. 

