Source : Webster's Revised Unabridged Dictionary (1913)

Pup \Pup\, v. i. [imp. & p. p. {Pupped}; p. pr. & vb. n.
   {Pupping}.]
   To bring forth whelps or young, as the female of the canine
   species.

Source : WordNet®

pup
     n 1: young of any of various canines such as a dog or wolf [syn:
          {whelp}]
     2: an inexperienced young person [syn: {puppy}]
     [also: {pupping}, {pupped}]

pup
     v : birth; "the dog whelped" [syn: {whelp}]
     [also: {pupping}, {pupped}]

pupping
     See {pup}