Seeing the Dhol'kai adult stage, I could not help but want a litter based on ancient Egyptian gods. They would work especially well for Seth and Anubis.
Another thing that seems nice is to have an Elemental litter - it could be just the basic four of Earth, Water, Air and Fire, or it could be a larger litter with four additional elements (Nature, Storm/Lightning, Magma and Mist for example). This could be done for pretty much any breed.
Or mythological creatures on their most closely matching breed: Selkie Otterlings, Kelpie Sleipnirs and the like. Or just mix it up and have us guess which is which!