As people have said before, it is completely impossible for a human female to be impregnated by a dog. The chromosone sets are far too different to allow for fertilization of the egg. In fact, the enzymes on the outside of a dog sperm may cause it to be out-right rejected by the human egg (the enzymes are what allows the male human sperm to break through the surface of a human female egg and fertilize it).
Also, a human body would not accept a dog egg fertilized by dog sperm; it would reject it for the same resons as above: the enzymes and proteins are all wrong, and the human body will know it is foreign material.
This is the same reason why cabbits (true cabbits) do not exist. There are cats that have genetic deformities and whatnot... But that's another story, and those are still completely cats and not rabbits at all.