You can train a really good recall, but you should start while he is on leash or long line. If you go to www.cleanrun.com, you can buy a copy of Leslie Nelson's "Really Reliable Recall" DVD. I find that if you start right from the get go with her method, before the dog gets the idea that "come" is optional, it's really easy. If I can do it with a hound, you should for sure be able to get a great recall on a herder. Looking at your dog, though, I'm guessing there's some Catahoula, maybe ACD, but also some terrier. Regardless, he's a really cute dog - love the tail (which is what reminded me of ACD). Good luck with him.
P.S. I do know what a "farm dog" is, but that doesn't mean I think they should sleep outdoors - except the livestock guardians. If the dog can't come in, a warm barn will do, as will a very well constructed dog house, but herders in general are not as happy away from you as they are near you.
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"If you talk to the animals they will talk with you and you will know each other. If you do not talk to them you will not know them and what you do not know, you will fear. What one fears, one destroys." - Chief Dan George
"The fidelity of a dog is a precious gift demanding no less binding moral responsibilities than the friendship of a human being. The bond with a true dog is as lasting as the ties of this earth can ever be." ~ Konrad Lorenz