The former prince remains in custody while searches take place in Norfolk and Berkshire.
Ashley Warren, the first person to be prosecuted under XL bully laws, will be sentenced in April.
Police were called to an address in Porthcawl over concerns of the welfare of a woman in her 80s.
A 33-year-old man has been arrested following the discovery at Little Eden Holiday Park.
Tiger Duggan had been receiving treatment at MedPark Hospital in Bangkok, his family says.