A Tindelhound is a type of Whistimmu, or a non-Spectral creature found in the Tempest in Wraith: The Oblivion. As their name indicates, Tindelhounds superficially resemble dogs. Because of Oblivion's taint, however, these dogs have far more heads, mouths, and eyes than the average canine; the most spotted were ten mouths and fifteen eyes. They are also much larger than the average dog, somewhere around 15 feet at the shoulder. In addition to their maws and size, they have barbed hooks instead of fur, emit green fire from their mouths, and leave a sooty trail behind. As if that weren't enough, Tindelhounds are also fairly intelligent, able to adapt to unusual situations fairly quickly. Luckily for wraiths, most of them shun the Shadowlands, living deep within the Tempest.
Compared to the other kinds of Whistimmu, Tindelhounds are fairly recent creations. The first one was seen coming out of the chest of a tempramental British wraith named Henry Tindel at the end of the Victorian Era; it is said Tindelhounds are an embodiment of Tindel's legendary foul attitude and have carried his name ever since. Tindel's situation has since proven uncommon; most Tindelhounds do not spring forth from the Corpus of wraiths.
Tindelhounds may have been inspired by the Hounds of Tindalos from the Cthulhu Mythos writings of H. P. Lovecraft and Frank Bellknap Long. These hounds have the ability to track their human quarry through any barriers, and may materialise from sharp angles.