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.
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            That awkward whelp with his money bags would have
            made his entrance.                    --Addison.
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   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.
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         Did thy foul fancy whelp so black a scheme? --Young.
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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]