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Hi Julia:
Here is some troubleshooting on the Triangle based on the information you provided:
1)Knowledge- His history could definitely have impacted his current behavior. Seems likely that he has some fear issues with men resulting from their abusive behavior. The breed can be prone to having dog aggression.
2-Health : has he had a recent vet visit to make sure there are no health problems that could have contributed to his change in behavior?
3-Attitude: Make sure you and anyone else who interacts with him is adhering to proper attitude. (patience, calm confidence, respect etc).
5:Pack Structure:You mentioned that he doesn’t think you are the boss 100% of the time. This could definitely be a reason for his new attitude on walks. If he doesn’t view you as leader all of the time, he will definitely be more prone to making his own decisions when he is fearful or unsure about a situation. I would review the pack structure section and make sure that you are following all of the rules.
6:Restless Spirit: Make sure he has the proper outlets for any pent up energy. This will make he easier to handle in situations and sometimes a little less reactive.
9:Obedience: Continue with phase 2 training. (maybe look into using a Starmark Collar for him instead of a pinch. the correction tends to cause less reactivity for dog aggression.)
Reinforce a command with any necessary correction ie: heeling past a person or dog. Staying in a sit as they pass by, etc.10: Desensitizing and Counter-conditioning: Use his obedience as a platform to change his perception of men, dogs etc. Example, when he is sitting or heeling in presence of men or dogs he gets high value treats. The presence of these triggers will start to mean good things instead.
Teaching him to wear a muzzle is great for safety and can in turn help you react more calmly and confidently.
Let us know how things go!
