If the two expectant dogs gave birth to 10 puppies each, the total number of puppies Nalani had is 10+10= <<10+10=20>>20
When they came of age, Nalani sold 3/4 of the dogs, a total of 3/4*20 = <<3/4*20=15>>15 dogs.
If each dog sold for $200, Nalani received 15*200 = $<<15*200=3000>>3000 from the sale of the dogs.
#### 3000