When I’m morphed as a cow, sheep, pig, or another small mob, I don’t fit through any doors.

Minecraft version: 1.12.2
Morph version: 7.1.0
iChunUtil version: 7.1.2

I didn’t know that. So it’s intended? It looks like these mobs should fit through doors. Oh well. ¯\_(ツ)_/¯

That's cause you're too fat. Not an issue.

:(

Wait hang on, which small mob are you talking about. You can't fit through doors for any mob that's larger than 0.8125 of a block.

(Cow Sheep and Pig are 0.9)