I want to start by saying I'm not new to training dogs, but I was taught by the trainer I used to work with to use a slip chain (choke chain) collar, and all training I've done has been on-leash training. That said, I don't like the idea of using that type of collar, and have been having some success with a nylon buckle collar, but my problems with training Dexter haven't been while he's on-leash. He generally obeys well, and is learning basic obedience commands (knows how to "shake" already, go figure, but we're working on "sit", "down", and "no". He does well on-leash, but as soon as I take the leash off while we are outdoors, he runs away, and refuses to obey any commands I give him. He seems to become deaf when I let him off the leash. I feel like we are making progress on-leash, but I'm wondering if I'm contributing to his listening problems while off-leash by only doing training using a leash and collar. . . Any suggestions? I am working on simple commands for now, as I just want Dexter to be more well-behaved and obedient, but we will be working on more advanced commands later on. Is there anything more I can be doing to enforce positive behavior and discourage negative? Is there any place specifically I can find a general overview of how to train my Boxer more effectively? Dexter is approximately 1 year old, maybe younger, maybe older, but he was a rescue, removed from a home where he was neglected, and he suffers from separation anxiety, and is terrified of crates, as he was "crated" any time his previous "caretakers" didn't feel like spending time with him. I haven't used the crate, he hasn't had any "accidents" in the house, and everyone who saw him the day I brought him home can agree, he is 100x happier living with me than he was that first day. If anyone has any questions, or if more information about my Dexter is needed, please let me know. I look forward to learning from all of you, and watching Dexter grow and thrive in his new home!