what does the narrator remark about the Chief traits of his dog, Montmorency?

Montmorency "does not revel in romantic solitude.  Give him something noisy; and if a trifle low, so much the jollier.  To look at Montmorency you would imagine that he was an angel sent upon the earth, for some reason withheld from mankind, in the shape of a small fox-terrier.  There is a sort of Oh-what-a-wicked-world-this-is-and-how-I-wish-I-could-do-something-to-make-it-better-and-nobler expression about Montmorency that has been known to bring the tears into the eyes of pious old ladies and gentlemen."