In chapter 6, whatbmade the dogs nervous when the deer was there?

Another unusual occurrence fell upon Paulsen while he was riding his dogs at night when caught a branch to his face and was temporarily blinded. When he could see again, he saw an eerie green glowing light. The dogs began howling their "death song," the noise they make when they think something or someone has died. Paulsen was initially curious but stopped when he thought he saw the glow take the form of something like a human. When he got closer he found a stump emitting the gas, which he later learned was the result of it sucking phosphorus from the ground and holding it in all day. But that night the mystery disappeared when Fonzie, one of Paulsen's dogs, came up and peed on the stump.