Animal welfare and PSNI officers seized some 60 dogs during a raid tonight on a suspected training camp for fighting dogs.
Pit bull terriers were among the dogs recovered during the operation in Co Down, about a mile from a puppy farm which was raided last night in Katesbridge.
The Ulster Society for Prevention of Cruelty to Animals (USPCA) and police recovered around 100 dogs during last night's raid.
The puppies were rescued from appalling conditions during a six-hour overnight operation.
The original raid was sparked when boxer dogs were spotted feeding from the carcass of a cow.
It is understood equipment used to train fighting dogs was also discovered in today's operation.
A USPCA spokesperson said today's find was significant.
"There appears to be a lot more pit bull terriers around these days," he said. "They have been used for dog fighting.
"The operation is continuing and it is likely that there could be more discoveries." Vets were called in to examine the puppies recovered from last night's operation on a farm building at Katesbridge.
The puppies have been sent to various locations across the North and also included Jack Russells and other dogs.
During last night's operation electricity supplies to the farm buildings were cut.
The find has prompted politicians in the North to demand tougher laws against those responsible for animal cruelty.
The nationalist SDLP MP for South Down Eddie McGrady and Democratic Unionist Assembly member Jim Wells have called for those caught being cruel to animals to face criminal convictions.
PA