Examples:
1.  "Not anxious to come in contact with their fangs, I sat still-but imagining they would scarcely understand tacit insults, unfortunately indulged in winking and making faces at the trio, and some turn of my physiognomy so irritated madam, that she suddenly broke onto a fury, and leapt on my knees. I flung her back, and hastened to interpose the table between us. This proceeding aroused the whole hive. Half-a-dozen four-footed fiends, of various sizes and ages, issued from hidden dens to the common centre. I felt my heels and coat-laps peculiar subjects of assault; and, parrying off the larger combatants as effectually as I could, with the poker, I was constrained to demand, aloud, assistance from some of the household in re-establishing peace.The herd of possessed swine could have had no worse spirits in them than those animals of yours, sir. You might as well leave a stranger with a brood of tigers!"  (chapter1- page 6-7)

2. "On opening the little door, two hairy monsters flew at my throat, bearing me down and extinguishing the light, while a mingled guffaw, from Heathcliff and Harton, put the copestone on my rage and humiliation." (chapter 3-page 15)

3.  "'Run, Heathcliff, run!'” she whispered.  They have let the bull-dog loose, and he holds me!   The devil had seized her ankle, Nelly; I heard his abominable snorting. She did not yet out-no! She would have scorned to do it, if she had been spitted on the horns of a mad cow. I did, though: I vociferated curses enough to annihilate any fiend in Christendom, and I got a stone and thrust it between his jaws, and tried with all my might to cram it down his throat." (chapter 6-page 41)

Analysis:
     We can find dogs appear several times in Wuthering Heights.  Almost all of them are not the cute or docile pets but always the ferocious biters.  So Emily often used fiends, monsters... etc., to describe them.   Emily loved the unruliness of the dogs. She maybe envied that dogs don't need to be restrained by the ceremony. Another reason Emily liked dogs so much maybe for the style of communication. She didn't need to talk to dogs and it suited Emily's reticent personality.
     There is a interesting thing that Emily sometimes even described some characters as dogs. (such as Heathcliff, Hareton.... etc.) For they have dog-liked wildness in their nature.

Examples:
1.  "And they were locked in an embrace from which I thought my mistress would never be released alive. In fact, to my eyes, she seemed directly insensible. He flung himself into the nearest seat, and on my approaching hurriedly to ascertain if she had fainted, he gnashed at me, and foamed like a mad dog, and gathered her to him with greedy jealously. I didn't feel as if I were in the company of a creature of my own species." (chapter 15-page 135)

2.  "It was eleven o'clock, and I announced my attention of going in, and waiting for Heathcliff, at which Hareton immediately flung down his tools and accompanied me, in the office of watchdog, not as a substitute for the host." (chapter 31-page 249)

3. "He(Hareton) is just like a dog, is he not,Ellen? she once observed,or a cart-house? He dose his work, eats his food, and sleeps, eternally! What a blank, dreary mind he must have!" (chapter 32-page 259)
 
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