Dog Health Questions: Off leash dog training?! ?

Can you tell me step by step how to train a dog to go offleash? I am in the process of training my dog for agility but she is ready for the next step! Off leash. I don't have a fenced in yard but would love to trust her without a leash. When I first got her she stuck to me like glue , I never had a leash on her and she listened , now I let her off leash and unless I have treats she runs! Do you have any idea why? Oh by the way she is a 2 year old havanese , she was 7 months when I got her.
So 2 questions :
Do you know why she started running away while off leash ?
Step by step how to train her off leash again, without treats?
Thanks

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Recommended Answer:
You need to train her to stay with you perfectly on leash. This means letting her drag a leash. when she gets to far either step on the leash or pick up the leash and call her to you. Praise her for doing so. You need to do this with all kinds of distractions, people, other dogs, food laying about, etc. As she starts getting good you can start shortening the leash. Most people have a tendency to take the leash off too soon. The dog then learns that he can away with murder when off leash. Taking your dog through a good obedience class would not hurt him either.

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