Markuskarkus,
I only just read this and it seems a lot of this chat got out of hand.
Reading your last comment though I believe you emplied that you are not responsible for your (crazy friends) actions ie your dog.
Now you're either trolling for the banter or completely irresponsible, because as a dog owner you must be responsible for its behaviour and actions in order to mitigate any harm coming to it or anyone else.
And surely repeating yourself saying things like "you touch my dog and see what happens" is a bit silly and inflamitary as I can't believe anyone will just start throwing down or stabbing dogs on the beach anyway it's all a bit far fetched aye.
Anyway live and let live enjoy the wind and look out for your mates on the water and your dogs