The RSPCA is appealing for information after four dead badgers were found in a field near Crymych.
A member of the public alerted the RSPCA to this incident on April 18th.
There were no visible wounds on the bodies and the badgers have been taken to an Animal Health vet who will conduct a post mortem into the cause of their deaths.
RSPCA inspector Gemma Black said: "These badgers died in suspicious circumstances, but we the need the public to help us pursue this matter.
"It may be that some farmers have decided to kill these badgers following the Welsh Assembly Governments (WAG) decision to cull badgers as part of the campaign to eradicate TB in cattle.
"We would like to remind everyone that the Minister for Rural Affairs has said that this cull will be licensed and monitored by WAG and that any other form of badger killing will be illegal."
Anyone who may have information about this incident should contact the RSPCA on 0300 1234 999. Calls are treated in confidence.