I think the “half human half werewolf” thing in monster high g3 purely just dictates how the werewolf will be born. Like a genetic gamble thing, kind of.
All werewolves have a human and wolf gene and, as we know, in biology genes can either be dominant or recessive.
Selena has both genes, implied that her wolf genes were dominant, Apollo only has the human gene.
SO, with that said, here’s how i see it:
Clawdeen was born with a dominant human gene and a recessive wolf gene. Therefore, she was born in her human form.
Clawd, on the other hand (paw?), was born with a dominant wolf gene and a recessive human gene. Therefore, he was born in his werewolf form.
I KNOW IM DEFINITELY THINKING ABOUT THIS TOO HARD BUT I NEED THINGS TO MAKE SENSE ALL THE TIME OR I GO CRAZY
Again, this is just my theory and you’re allowed to disagree, just be nice about it :3