I have a wonderful 3 year old male neutered Doberman who is the sweetest dog you could have indoors, outdoors is the problem both on and off lead. I have been advised it could be fear aggression or he is protecting me all i know is i want him to be happy outdoors and not so stressed out. His family live is fine he lives with our new puppy who is now 4 months old our 2 cats which he has no issue with and our 2 children who he adores. His history We got him at 17 weeks old as a rescue; he was re-homed because his original owners older dog would not allow him in the house and kept attacking him We went to puppy class training with him which he loved, we then started citizenship training but we never finish due to busy schedules. As a dog walker he spent most of his time with me at work and was very well socialized with other dogs and enjoyed their company. Things started going wrong when he turned about 18 months old and started to flex his muscles with other dogs including the ones i walked regularly which meant i could no longer take him to work with me. Although he knows his commands sit, down, stay and heal it is his heal that gives me the most issues since 18 months he has refused to walk next or behind be but always out in front even if i keep him on a short lead its a consent battle to keep him to heal, the only way he will heal is if i give him such a yank on the lead, he will then heal but if he sees another dog no matter what the distance he is straight back out in front. Once he sees another dog i can feel him stressing himself into such a state, he starts tip toeing and panting heavy, he is sometimes in this state only moments from leaving the house even when no dog is in sight it is this behaviour i want to understand and help him get over so he can be as laid back as he is in the house.