All of those questions can be answered with ease. 3 things Buddy would sell his soul for? ME, Hotdogs and any type of human food.
Type of collar that he wears is a combo. Outside I usually put him in a harness because I use a long line to give him freedom while on play walks. or I will use a 6 foot leash for normal walks that he has to stay close to me on. The collar he wears is mostly for tag keeping which was just switched from a regular flat collar to a rolled leather one.
I have been staying away from the gentle leader or Halti because I assumed he was to little.
Tail... UP and Wagging mostly when around other dogs. In the house it is usually half mast or up but he knows I am "leader".
I understand what you are saying about the behaviors, and I do see it in him. He does have aggressive tendencies but to me appears to be more noise than bite. If I see another dog approaching I either attempt to get as far away as possible if no escape route is available or I know he is ok at a distance with a certain dog. Otherwise I will pick him up and take him through in my arms (probly not the most recoomended method)
I will not be around til late sunday so I will talk more with you then,
Hope you have a great day/night.
Jodie and Buddy