Four men have been arrested as part of the investigation
A stolen greyhound worth around €1 million has been found safe and well.
Race winner Clare's Rocket was taken from Kennels in Golden in Tipperary at the weekend.
The dog is owned by the Limerick-based Full House syndicate, and was ranked as second favourite for the English Derby.
Four men have been arrested - two are being held in Tipperary Town, while two are detained in Clonmel Garda Station.