One of my players, and yes, I got full verbal release first from both him and the newfies owner. I tried to get verbal release from the newfie but he just bounced up and down and drooled, I took that as a yes.
The newfie is only a puppy at the moment. Healthy adult weight should be between 100-150kg. Currently he is only 80 kg or so.
They're relatively low-drool for such a huge dog. Used to play with one on a regular basis when I was about 8. I was taller than his shoulder, barely. He'd jump on me and wrap his forelegs around me and roll around.