I recently added Witch to my horrendously multi-classed Fighter and found this little brain teaser. I had adopted a Blue Russian (cat) as my linked familiar whom I can cast self-altering spells on, including Long-Arm. Seeing as my partner is Quadrupedal, I imagine something like this happening during the effects of the spell
Anyway, would my cat be considered a medium creature or be a tiny creature that just so happened to stand 5'3"?