Morgan (16 months) is a smashing dog, very friendly, loves playing with other dogs and is now starting to "read" their body language a bit and becoming a little more cautious but mainly expects all dogs to want to be best friends with him. If the other dog is onlead we put Morgan onlead and they usually say a gentle hello before moving on.
Today, however, it was a bit different on our woodland walk.
We were at the end of our walk and saw a woman, 2 small children, and a dog onlead walking towards us, so we put our boy onlead. As soon as Morgan caught sight of the other dog he started growling quite deeply and then began barking. He's only ever growled in play with tug toys etc. before now, so we were totally taken aback. The other dog then started barking as well so we kept a wide berth while passing them. It had a flat bulldog type face and I wonder if this was a significant factor?