No.
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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.
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
In Pokemon Black & White or any other Pokemon, you can catch water type Pokemon in the sea or by using a fishing rod.
no you can't make poffins in pokemon white or black i couldnt find any of the stuff to do it
Any Pokemon can breed with Ditto unless they are legendaries.