Golden Slipper favourite Earthquake has come through a crucial track gallop without incident, easing concerns about her fitness before the $3.5 million race at Rosehill.

But the unbeaten filly still has to pass a Racing NSW veterinary examination after she was put on antibiotics to combat an elevated temperature.

Peter Snowden told stewards on Tuesday there had been a minor spike in the filly's temperature, forcing the Darley Australia trainer to change Earthquake's training routine.

Race jockey Kerrin McEvoy worked Earthquake at Warwick Farm on Wednesday morning and he delivered good news to Snowden and the rest of the Darley team.

"She gave me a nice feel in her work and it certainly points to her getting there on Saturday in really good order," McEvoy said.

Earthquake has dominated betting on Saturday's Golden Slipper since winning the Blue Diamond Stakes in February.

She eased marginally to $2.30 after Tuesday's barrier draw when she came up with gate 13 but remains a clear top pick over Mossfun.

Earthquake defeated Mossfun in their only clash in the Reisling Stakes at Rosehill on March 22.

Racing NSW senior veterinarian Dr Craig Suann will inspect Earthquake but McEvoy said he expected the filly to be given a clean bill of health.

"She never missed any feed and other than galloping on a Wednesday instead of a Tuesday she hasn't missed any work at all," he told Sky Sports Radio.

"It's not as if she was lying down and was sick for two or three days. It was only a small bump in the road."

Mossfun has been the best-backed Golden Slipper runner since the draw, firming from $6 to $5.50 with further support on Wednesday morning.