I would imagine it would become dangerous, but I'm not sure. The reason I am posting is because this reminds of my boyfriend's boxer. We went to the shore and Harley (his boxer) went right in and gulped up a ton of saltwater. Then he pukes it up. You think he would stop there.....nope! He started gulping more, then would puke. He was so excited by this. We were trying to get him to stop but were laughing too hard because he was so excited to be drinking saltwater than puking it up over and over again. Finally we dragged him out and quickly walked away from all the puke spots drifting in the ocean. Yuck.
