lackey vs lap dog

lackey

noun
  • A fawning, servile follower. 

  • A footman, a liveried male servant. 

verb
  • To attend, wait upon, serve obsequiously. 

lap dog

noun
  • A person who behaves in a servile manner, such as a sycophantic employee or a fawning lover. 

  • A small toy dog, kept as household pet, whose light weight and companionable temperament make it both suited and disposed to spend time resting in the comfort of its master's lap; a dog bred to behave in this manner. 

How often have the words lackey and lap dog occurred in a corpus of books? (source: Google Ngram Viewer )