Shore Cat

Shore cats are small amphibious creatures that could be described as half cat, half shark. They have razorsharp teeth and are quick as a whip. Although some view them as excellent pets, a wild shore cat should always be approached with caution.
  Shore Dweller. Much like a regular cat compared to a lion, shore cats are a much smaller species than their sea cat cousins. Shore cats can be encountered in the wild but are predominantely a domesticated species. Merfolk as well as the people of Tiomera are known to raise and keep shore cats. Some keep them purely as a companion animal, while others keep them to hunt the pests around their home. Shore cats are an amphibious species and can breathe air as well as water. Typically, shore cats fare well in an environment where they can enjoy a spot on land or close to the surface where they can bask in the sunlight and close to a dynamic body of water where they can play and hunt. Because of this they are not only found in underwater communities of merfolk, but also in the wild on the shores of oceans, aboard seafaring vessels across the world and in the harbors and streets of seaside cities.