His work means that his hands often stink of horse excrement.
The stench sometimes lingers, despite his best efforts, says Mr Purushotthaman Selvaraju matter-of-factly.
The 32-year-old is in charge of putting shoes on horses and the animals tend to step in their own waste.
So he tries to be considerate to those around him when he's on the way home after work.
"When I take public transport, I try to avoid the crowded trains," says the Penang native, who is a permanent resident here.
Mr Purushotthaman is one of about 22 farriers here. A farrier's job involves trimming the hooves of horses and placing shoes onto them, so that they can trot, canter or gallop comfortably.
He also treats the horses if they contract fungal infections in their hooves