I have noticed occasionally my 19month old Newfie is howling/screaming in his sleep. The first time he did it he woke me up and I had no idea what was happening- it sounded exactley like my boyfriend's voice, screaming with the tone getting deeper and deeper as it goes on- as if he's falling off a cliff!
I've heard him do it about five times now, and when it happens it continues for at least 45 seconds before I manage to wake him! It is really quite loud- I wouldn't be suprised if my neighbours can hear him (and he sleeps inside!) And I've never heard him howl at any other time!
Has experienced anything similar?