Whip the pet (3)
I believe the answer is:
cat
I believe this is a double definition.
'whip' is the first definition.
(cat o' nine tails, cat for short is a type of whip)
'the pet' is the second definition.
(cats are often kept as pets)
(Other definitions for cat that I've seen before include "See 23" , "Eg, tiger, lion" , "Lash < jazz fan" , "Feline - whip" , "Sailor's whip with nine knotted strands" .)