Pet Default Eyes Broken After Patch
Just a note - after the patch I noticed all my pets with custom painted coats had turned completely black. Replacing the pet with a fresh copy from the gallery didn't work - once in gameplay mode, they'd turn black too.
After some troubleshooting, I discovered it was the default eye replacements for dogs and cats that caused it - specifically Wrixles' eyes. This was the only dog and cat CC I had and removing it allowed new pets to be created and not turn black in game but it didn't fix the ones already affected. I had to revert to an earlier save pre-patch
If you have default replacement pet eyes, I'd suggest removing them entirely before updating. Unknown if this affects horses that use Wrixles' eyes, I use a different default replacement with no issues.