Re: Leash aggression/pulling with other dogs
I found that getting aa FRONT clip harness, that the leash clips at the breast bone works extremely well for leash reactivity. Many dogs have leash reactivity and not actual aggression to other dogs. The difference is, when dogs meet head to head at the end of leashes a buch of physiological things are happening that signal the dog to pull and bark. After awhile this becomes a habit. A snug fitting front clip harness ( take it off at home) will cause the dog to turn and look at the leash handler in stead of the physiological response of pulling that happens with a collar or back clip harness. You may still have some work to do with the dog it the pulling and bark or snapping has gone on for awhile. A great resource for this is the book "Ckick to Calm" Not every one loves clicker training and you can use a verbal marker instead of a clicker. The book has an excellent protocol for this issue . I am not affiliated with the author or Karen Pryor.

@eeeefarm I would calmly without eye contact get up immediately and give him a time out or do something where he can't get your attention. If he is looking for attention engaging him gets him attention. You might try having a short brushing session or other physical attention on a cue so he knows when attention is coming. Sounds like he is getting enough exercise etc. This method is called extinction which sometimes will cause a little temper tantrum of increased behavior right before they perminatly give up.

Re: Leash aggression/pulling with other dogs
I found that getting aa FRONT clip harness, that the leash clips at the breast bone works extremely well for leash reactivity. Many dogs have leash reactivity and not actual aggression to other dogs. The difference is, when dogs meet head to head at the end of leashes a buch of physiological things are happening that signal the dog to pull and bark. After awhile this becomes a habit. A snug fitting front clip harness ( take it off at home) will cause the dog to turn and look at the leash handler in stead of the physiological response of pulling that happens with a collar or back clip harness. You may still have some work to do with the dog it the pulling and bark or snapping has gone on for awhile. A great resource for this is the book "Ckick to Calm" Not every one loves clicker training and you can use a verbal marker instead of a clicker. The book has an excellent protocol for this issue . I am not affiliated with the author or Karen Pryor.