As far as I've seen, there are two types of ears: The pointed type (see Oboro), and the droopy type (see Dorii/Guraa, or those couple of guys in the screenshot above).
However, it can be seen that the first guy (whose face cannot be seen), is of the 'droopy ear type' but has a tail, while the 4th guy from the right has ears like Oboro (the pointed type), and ALSO has a tail.
Therefore, I conclude that there is no correlation between ear-type and tail existence. My guess is that it's something that's drawn up randomly.
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