He is neutered, and has had obedience training, passing all levels.
When he greets a dog, he usually sniffs and occasionally the two dogs show aggression. He doesn't tower over the dogs and I'm not sure where his tail is positioned. On a lead he will greet dogs by sniffing but if they are on the other side of the road and he can't get to them then he will bark and pull aggressively. He stayed at a dog borders for 3 weeks in the summer and mixed with up to 8 different dogs per day. The boarder never said he was aggressive towards any of the dogs, but he wanted to play with them all the time and they were getting fed up. By playing I mean play fighting but gently.
His recall is ok, but if he's fixed on something that takes his interest then he carries on towards the target, ignoring me.
He is also very vocal when someone comes to the door and his bark is quite aggressive especially towards the postman.
When he sees people he jumps up to lick their face altough we have worked hard to stop this and he is getting better.