Hey there
Sorry I'm late, but I just found you by googling "border collie howls" :)
Well, my border collie has been doing this for a few years now, and I have never encountered another dog that does the same!
Did you dog sound like this ?
youtu.be/D_1NHI8JIB4
Remi (French guy that doesn't know anything about MMO)
Understandable if this was found on accident by Google, but we don't allow threads to be necro'ed on these forums, and as this is a 4 year old thread, I'm going to close this here.