Four men once famed among Victoria's greyhound racing industry have indicated they will plead guilty to animal cruelty offences over the use of live rabbits and pigs to bait dogs to run faster.

Lawyers for former trainer Anthony Mills, a one-time legend in greyhound racing, his son Stuart, fellow track manager Lawrence Cunningham, and Darren McDonald, a dual Australian trainer of the year, on Monday told Frankston Magistrates Court the men would all formally plead guilty next month.

Greyhound trainer Anthony Mills at Frankston Magistrates Court on Monday.

The four are among a group of 14 greyhound racing figures connected to a training track in Tooradin who were charged following raids by RSPCA investigators and police at tracks in Victoria, NSW and Queensland.

The Victorian group are charged with offending between November 2014 and January last year.