One person, however, better served by his instinct, had known the rattle from the first; and that was Chuchu, the dog. No rational creature has ever led an existence more poisoned by terror than that dog’s at Silverado. Every whiz of the rattle made him bound. His eyes rolled; he trembled; he would be often wet with sweat. One of our great mysteries was his terror of the mountain. A little away above our nook, the azaleas and almost all the vegetation ceased. Dwarf pines not big enough to be Christmas trees, grew thinly among loose stone and gravel scaurs. Here and there a big boulder sat quiescent on a knoll, having paused there till the next rain in his long slide down the mountain. There was here no ambuscade for the snakes, you could see clearly where you trod; and yet the higher I went, the more abject and appealing became Chuchu’s terror. He was an excellent master of that composite language in which dogs communicate with men, and he would assure me, on his honour, that there was some peril on the mountain; appeal to me, by all that I held holy, to turn back; and at length, finding all was in vain, and that I still persisted, ignorantly foolhardy, he would suddenly whip round and make a beeline down the slope for Silverado, the gravel showering after him. What was he afraid of?