I was searching for "Ryukyu tora" on the Internet and was dismayed to find very little information. Ryukyu tora (tora = "tiger"), or sometimes Ryukyu Inu or Ryukyu turaa, is the breed of my last dog, Courtney, and I figure her memory deserves a lot more respect from the Internet. Courtney was a street mutt that we picked up as a puppy. I began to suspect she might an actual breed when I ran into another street dog that looked exactly like her with different coloring. After seeing photos of Ryukyu toras in a local paper, there were enough physical similarities that I decided I could call her a Ryukyu tora if I wanted to. A ryukyu inu page I found has even more photos, including a poster that has Courtney's tawny coloring labelled as the 'Aka turaa' (red tiger) breed.
All Ryukyu inu are all mutts, as World War II was not particularly kind to Okinawan dogs and the American occupation afterwards brought many non-native dogs to the island. In the early 1980s they discovered a pack of dogs in the nothern rainforests that was genetically distinct and designated it a breed. Since then, the preservation society has 'stabilized' the breed and there are now two official lineages, Yanbaru and Yaeyama, based on where they were found. There are probably less than a thousand of the Ryukyu inu around, though there might be a lot more if more stray dogs were rounded up.
According to some pages I found in Japanese Dogs: Akita, Shiba, and Other Breeds :
Ryukyu inu are medium sized dogs... [and] look very much like wild dogs, which gives the impression of extreme ferocity, but, quite to the contrary, their disposition is mild and amiable and they make loving pets. Nevertheless, they have a strong territorial instinct, and they are not necessarily good with other animals. At one time they were used to hunt wild boar, and one should bear in mind that their hunting instinct is alive and well. [I've included the Ryukyu Inu pages from the book below if you'd like to sample the book]
This description pretty much matches my experience with Courtney, except that she looked very sweet and not the least bit ferocious. She was a very loving dog who enjoyed being pet or sitting out in the yard with you staring out at the ocean. She was also a thirty pound dog that commanded respect from larger dogs.
When we were staying at a friend's house, she wouldn't let their dog enter the same room, so he would just sit there in the adjacent room sadly staring in. She also required eight Marines to hold her down for a shot and she destroyed a dog toy with a three month guarantee in a single night. We bought her three stuffed animal toys, figuring that they might last her awhile. The first lasted a week, the second a day, the third had a hole in the heart within minutes. She definitely enjoyed the hunting of wild stuffed animals.