lap dog

Short definition from Wiktionary

Noun

1. 1
   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.
2. 2
   A person who behaves in a servile manner, such as a sycophantic employee or a fawning lover.
3. 3
   Alternative form of lap dog.