What do the dogs add to the atmosphere of "Wuthering Heights"?
The dogs add an emotional facets to the story. At first, they add a sense of fear and danger to Wuthering Heights when when they frighten Mr. Lockwood on his first visit to Heathcliff. Their presence immediately adds a sense of foreboding to the visit.
However, the dogs at Thrushcross Grange are pampered pets. The argument that Catherine and Heathcliff see between a young Edgar and Isabella over the dog reinforces the idea that the Lintons are spoiled, pampered children.
When Heathcliff almost kills Isabella's dog, we see how bitter and heartless he has become. In each case, the emotional impact of the scene is enhanced by the presence of the dogs.
The dogs in Wuthering Heights creates this atmosphere of controlled hostility. Dogs have this ability of being vicious but they are controlled into being vicious. Just like when Lockwood tried to approach Heathcliff's dogs and pet them they growled at him in a manner that "provoked a long, guttural gnarl." Then slowly but surely the Heathcliff's dog circles Lockwood creating an atmosphere of hostility. Lockwood recounts how he "sat still" "not anxious enough to come in contact to with her[the dog] fangs."