The Collaborative International Dictionary of English v.0.48:

Puppy \Pup"py\, n.; pl. Puppies. [F. poup['e]e doll, puppet.
   See Puppet, and cf. Pup, n.]
   1. (Zool.) The young of a canine animal, esp. of the common
      dog; a whelp.
      [1913 Webster]

   2. A name of contemptuous reproach for a conceited and
      impertinent person.
      [1913 Webster]

            I found my place taken by an ill-bred, awkward puppy
            with a money bag under each arm.      --Addison.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Puppy \Pup"py\, v. i. [imp. & p. p. Puppied; p. pr. & vb. n.
   Puppying.]
   To bring forth whelps; to pup.
   [1913 Webster]

WordNet (r) 3.0 (2006):

puppy
    n 1: a young dog
    2: an inexperienced young person [syn: puppy, pup]