Soulmates found one story at a time.

The ahuizotl are aquatic dog-like creatures. They resemble large wolves with pointy ears, but have smooth, rubbery sides like a dolphin rather than fur. Their front paws end in raccoon hands and their tails have a human hand on the end. 

They lure prey with a sound like a human baby crying, and drown their victims – who end up lacking bones, eyes, fingernails and toenails, so only an empty skin is left behind.

Ahuizotls live in packs, are loyal, and extremely intelligent.

One is rescued from Inedel, the Eel Mage’s island in Ember‘s Light.

Norrix runs into a pack of them in Aztlan in Myth‘s Legend, and returns the ahuizotl from the mage’s island to his pack in Musette‘s Fate.