Tried to use this pack
https://www.planetminecraft.com/texture-pack/pomeranians-better-dogs/
on Optifabric version 1.13.10, Optifine 1.19_HD_U_H9.
The result is wolves having a big gap between their head and their body like this:
https://postimg.cc/vgQwXJj2

I've tested the same on plain optifine without fabric+optifabric and that doesn't seem to be an issue.

To me is working fine on 1.19.2:

Tested on 1.19 with latest optifabric: