Fang shui, the tooth about the issue.

[Keroa]

Seekers don't even remotely have fangs, not even the teeniest tiny ones visible in the first image.

"They are perhaps known best for their striking eyes-the result of their vertically aligned pupils and faintly colored irises." In 1.0 they were also easily discernible by their shorter, fluffier tails. My point here being that it is not listed for seekers to genetically have fangs, save the rare occurrence of crossbreeding.

Honestly, I actually like that they have so much diversity on something relatively minor.

Were there a lot of diversity, I would be inclined to agree, however, this is literally one mouth. two if you count the different face type.

So lets say that yes, they added the small fangs for the player to have the option of smaller teeth. They are limited to one choice of mouth, and two face types, meaning if they spent hours in the creator making their baby look perfect, only to find out that they picked the -wrong face type- they are stuck with the longer fangs, regardless.
I honestly feel like we as players shouldn't have to make this choice.