A sushi dog's ears are for listening, of course! They're also used for communication and are often very expressive, standing tall when on alert and laying flat when distressed. Ears are typically small and slightly rounded, and are positioned more towards the sides of the head than on top.
Tails are often used for communication, but oftentimes aren't very suited to it. Soosh tails come in a wide variety of sizes and shapes, and each one has its own use. Floral tails may have a pleasant and calming aroma, aquatic tails may be helpful in swimming, and other tails may just be nice to look at.