By dog Pokemon I assume you mean the Legendary Beasts (Entei, Raikou, Suicune). You can them get into your Pokemon White game by using the Transfer Lab, but you can only use the Lab if you've beaten the main story.
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No.
there is no Pokemon in the black and white Pokedex with that definition but by big dog you probably mean either Herdier or Stoutland depending on how far you are in the game
dog Pokemon includeUMBREONESPEONVAPOREONFLAREONJOLTEONGLACEONLEAFEON
Yes. You find zekrom in Pokemon white and the white Pokemon in Pokemon black.
there are about 7 dog Pokemon in diamond and pearl.