The Collaborative International Dictionary of English v.0.48:

Whelp \Whelp\, n. [AS. hwelp; akin to D. welp, G. & OHG. welf,
   Icel. hvelpr, Dan. hvalp, Sw. valp.]
   [1913 Webster]
   1. One of the young of a dog or a beast of prey; a puppy; a
      cub; as, a lion's whelps. "A bear robbed of her whelps."
      --2 Sam. xvii. 8.
      [1913 Webster]

   2. A child; a youth; -- jocosely or in contempt.
      [1913 Webster]

            That awkward whelp with his money bags would have
            made his entrance.                    --Addison.
      [1913 Webster]

   3. (Naut.) One of the longitudinal ribs or ridges on the
      barrel of a capstan or a windless; -- usually in the
      plural; as, the whelps of a windlass.
      [1913 Webster]

   4. One of the teeth of a sprocket wheel.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Whelp \Whelp\, v. i. [imp. & p. p. Whelped; p. pr. & vb. n.
   Whelping.]
   To bring forth young; -- said of the female of the dog and
   some beasts of prey.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Whelp \Whelp\, v. t.
   To bring forth, as cubs or young; to give birth to.
   [1913 Webster]

         Unless she had whelped it herself, she could not have
         loved a thing better.                    --B. Jonson.
   [1913 Webster]

         Did thy foul fancy whelp so black a scheme? --Young.
   [1913 Webster]

WordNet (r) 3.0 (2006):

whelp
    n 1: young of any of various canines such as a dog or wolf [syn:
         pup, whelp]
    v 1: birth; "the dog whelped" [syn: whelp, pup]

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "whelp":
   Seeing Eye dog, animal, bandog, be confined, bear, bear a child,
   bear young, beast, birdling, bitch, bowwow, boy, bub, bubba, buck,
   bud, buddy, calf, calve, canine, cast, catling, chick, chickling,
   chicky, colt, cub, cur, dog, dogie, drop, duckling, fancy dog,
   farrow, fawn, fellow, fledgling, foal, fryer, give birth, gosling,
   guide dog, gyp, have, have a baby, have young, hobbledehoy, hound,
   hyena, insect, kennel, kid, kit, kitten, labor, lad, laddie, lamb,
   lambkin, lap dog, lie in, litter, manchild, master, mongrel,
   muchacho, nest, nestling, pack of dogs, pig, piglet, pigling,
   polecat, polliwog, pooch, pullet, pup, puppy, reptile, schoolboy,
   serpent, sheep dog, shoat, show dog, skunk, sled dog, slut, snake,
   sonny, sonny boy, swine, tadpole, throw, toy dog, travail, varmint,
   vermin, viper, wale, watchdog, weal, weaner, welt, whelk,
   working dog, worm, yean, yeanling, young man, youth