Greyhound Racing NSW is investigating after three dead rabbits were located in training areas on a Cessnock property during a targeted inspection.
A man involved in the industry has been suspended pending an investigation.
A post-mortem examination will be carried out to determine how the animals died, and whether they may have been used in live baiting.
David O'Shanessy from the RSPCA has told Hit 106.9 they were seized because they were found deceased. However a veterinary pathologist will still need to "confirm how they died, when they might have died and the circumstances surrounding their death".
GRNSW General Manager Regulatory Stephen Dodd says most trainers are doing the right thing.
“The message remains clear – GRNSW and the industry will not tolerate participants that cannot or will not meet the required welfare and integrity standards. Anyone who engages in such acts is not welcome in greyhound racing,” Mr Dodd said.
The maximum penalty for live baiting is a fine of $22,000 and two years prison.