I have seen them get slobbering mad many times but never spit at each other.
I can remember watching a big buck one time walking sideways towards another buck with all hair stood up and ears flat. Rolled his eyes half back and started slobbering like water was pouring out of his mouth. His tongue constantly licking his lips. One of the best bluffs I have ever seen in nature. Dam deer looked like he was possessed.
Thanks for sharing.