I was out in the local woods a while ago, and say 2 slow-moving elderly collie dogs wandering towards me, followed by an even more slow moving and more elderly owner.
As is my usual practice, I slowed right down as I approached the first dog, and said hello to it. Normally, the majority of dogs who are excitable and look somewhat threatening are just looking for some attention, so I make a point of doing just that.
The first old collie just looked at me and carried on wandering past. His mate then got to me, and I said "hello". He somewhat surprised me by saying "hello" back! I am not kidding here.
I waited a couple of mins for the old wifey who was with them - "I think your dog just said hello to me" - "Yes, he does that sometimes!"
Got to love the local woods. Something new every time I venture in there!