For the fur there was a few methods. The hair, I basically made two Hair Tuft meshes which I actually made out of merged prisms until I got the number of triangular planes I needed, and then pinching the ends that I would draw out into hair spikes. The hair overall is made up of 8 tufts. The cheek tufts were made of stacked cuboids and it was a little jank and looks not great when the shading is turned on. I'm wondering if I should use a cylindrical plane in the future for that. The tail was a lot easier, just a bunch of extruded cylinders, and then I extruded the sides, pinching the vertices into pyramid shapes before stretching into spikes.
The main trouble with this model was definitely the occurrence of concave planes. I think there were two overall that I had to delete, make a plane, invert it, and then merge it in place of the old plane to fix this.