Charm Person doesn't work on PCs in animal form.

[Egon the Monkey]

I have no idea if this is a bug or a feature. But I used it on a PC in dog shape and it didn't cause a Will save.

[Halfbrood]

Charm person doesn't work on animals afaik

[SkillFocuspwn]

Charm Animal would work on them; but charm person would not.