I have never seen a relation between dogs marking in public areas and the reactivity issues you have. I have never seen a dog exhibit territorial behaviors in a "common" area such as a park, unless it is being territorial about it's owner, it's vehicle, or the spot it is standing on at the moment. I've had territorial dominant dogs, and yea, they remark the same places when out in public, but they don't show any real ownership of those areas.
As for the treats, will he work for treats when he's in his comfort zone? If he will, then when he stops taking treats while he's agitated, it's a good indication that he's overloaded, at which time he is unable to learn anything. While the toy at that point might help redirect him, he still is in a frame of mind where there is little to no learning happening.
As for the treats, will he work for treats when he's in his comfort zone? If he will, then when he stops taking treats while he's agitated, it's a good indication that he's overloaded, at which time he is unable to learn anything. While the toy at that point might help redirect him, he still is in a frame of mind where there is little to no learning happening.
Off leash at parks he is fine. If we are not working on commands I do let him instigate chases with the other dogs as this is his favorite activity. He extremely fast and can turn on dimes. He can't out run whippets but I have seem him out manuver them in these open park situations. But since we have gone into serious obedience I restrict dog park rodeos and set up specific play dates with other friendly dogs and their owners. I have received comments from friends and family about how more relaxed he seems - so after a month I'd say thats is a win. But the reactive behavior is a big hurdle and almost seems impossible overcome at times.