I'm going to go from a different direction now, because Fencedude's response reminded me of something I had noticed and felt awhile ago. We aliased specific animal girls to specific ear tags, but after thinking about it and looking at it, I think what we did was actually a mistake from the get go. For most of these types of animals, what people are doing isn't actually tagging specific items, they're essentially tagging the character things like wolf, dog, cat, fox, etc and then tagging the specifics using that information. The specific items (ears and tails) are only secondary information generated using what the character would primarily be tagged with to begin with (ie wolf person, tiger person, fox person). In short most of these animal ears and tails are not so much the objects that define the whole, but parts that can only be defined by knowing what the whole was to begin with.
A person sees a character, lets use post #134649. Now lets say that all the person can see is the ears of the character and they have no clue who this character is. What is there that defines these ears as "wolf" ears as opposed to cat, dog, or some other general animal? The shape? The color? None of that really provides any information to what type of animal these ears are. Now we throw in the character's tail and now we can see this person is likely some sort of canid personification, perhaps most likely a wolf taking into account the hair color. The point is, the part itself can not be identified as what we're tagging it without having to look at and classify the whole image to begin with. Essentially I've had to tag this character a "wolf girl" before I could turn around and say those are wolf ears.
Perhaps you might argue, well I can use the tail to identify the animal instead. Okay, lets try again. The character has a long slender tail, that should be obvious, so lets use post #1072118. I look at the tail and I'm thinking it's probably a cat? I've seen so many other cats with similar tails. Well lets look at the ears to double check, they're kind of cat like, obviously this character is a cat girl and those are cat ears and a cat tail. Wait, as it turns out this character is a genderswap of the monkey king from Journey to the west. Oh, well since we know the character is a monkey, obviously that is a monkey tail and monkey ears. Again, you end up labeling the character "monkey" before you end up labeling the specific parts. Essentially all these specific tags end up being nothing more than a very bloated replacement for a <animal>_person tail or <animal>_person animal_ears search.
Bunch of other examples:
post #1051341 is a cow tail, because given the visual information we can label this character a cow person. As opposed to it being a lion tail, such as in post #973092 which has little in the way of a visual difference.
post #1084015 which we label cat ears due to background information labeling this character as a cat person, as opposed to post #1025803 which is labeled fox ears because we can label this person a fox girl again due to the artist.
post #30166 which we label mouse ears due to visual cues beyond the ears, as opposed to bear ears like in post #451197.
post #1080621 which is tagged cat ears, probably because there is no other information and by assumption we label these "cat ears." They could just as well be wolf ears.
post #199100 labeled wolf ears and wolf tail, but only because we would label the character a wolf girl, despite visually being more similar to what we commonly see with a fox person with their fox ears and fox tail.
post #1068927 which is label fox_ears because background information and visual cues (tails), but more importantly we don't label them dog ears, wolf ears, dog tail, or wolf tail because only the background information (either knowledge of the character or knowledge of the 9 tailed fox concept) that labels this character a fox person.
In short, the direction we should have gone was trying to classify the characters by types to begin with (much like classifying specific monster types), as opposed to trying to classify their parts. Encapsulation of the entire concept with a tag, as opposed to breaking down the concept into parts which rely on the whole to be identified in the first place.