PET groomer Sun Hu was jailed two weeks for using a clipper to hit a dog last month.
The three-year-old Maltese terrier died of head injuries while still on the grooming table.
A district court heard on Friday that Sun, 24, had been working for a year at the Strawberry Pet Shop in Corporation Road in Jurong.
On Sept 13, Mr Deva Rajan Kamalasanan, 47, brought his pet, Junior, to the shop for grooming. About 30 minutes later, he received a phone call telling him that his pet had died.
A post-mortem by the Veterinary Pathology Branch of the Agri-Food and Veterinary Authority (AVA) revealed that the dog had been hit on the head.
The maximum punishment is a $10,000 fine and a year in jail.