pet in WordNet English dictionary

1. preferred above all others and treated with partiality
   "the favored child"
   favored  favorite  favourite  best-loved  pet  preferred  preferent 
   

1. a special loved one
   darling  favorite  favourite  pet  dearie  deary  ducky 
   
2. a domesticated animal kept for companionship or amusement
   pet 
   
3. a fit of petulance or sulkiness (especially at what is felt to be a slight)
   pet 
   

1. stroke or caress gently
   "pet the lamb"
   pet 
   
2. stroke or caress in an erotic manner, as during lovemaking
   pet