Why does Li Pan know so much about it? Because K also raised a few in this dimension. Once during a chat, K even sent a video to Li Pan, although there were no dogs to be seen—just a few dog clothes floating around catching a frisbee, which was quite eerie...
Actually, 0791 originally didn't have Hellhounds, as they were highly sought-after products that were in short supply. Moreover, the confidential technology was only available at the Blood Clan Headquarters, and they were a combination of biotech and military weaponry, so smuggling them directly was impossible due to the excessive bureaucratic red tape required to raise them on Earth.
