I am having the same problem with Alfie
He had his first fight the other day with a working cocker who he has met on many occasions before . Ashley was getting very excited and trying to say hello to me and Alfie put his paws up on Ashley's neck and it all kicked off
I was shouting at him to leave and managed to grab his collar eventually , but that was after Ashley had him pinned to the ground.
His owner was full of apologies, but it wasn't really her dogs fault.
Alfie seems to be like this with other dogs who are excited and pleased to see you. He was growling and chasing a dog twice his size last week. I thought it might be male dogs but he is fine with the two westies and my friend has got a border cross, and he's friends with him. I think he's protecting me ? If I see another dog coming now I put him on his lead but sometimes it's not possible as he's either miles behind me or up in front.