Cinderella, new to home life is gentle, plus her underbite helps her to take the cookies carefully.
Buddy is completely toothless and his bite is ever so gentle by default.
Crystal came from a home with small kids. I’d almost bet she was taught to have a very soft mouth when she took her cookies.
Minnie is pretty gentle, she is such a munch mouth though, she’s rather get her own cookies out of the cookie jar.
Not pictured is Flo. She prefers three or four fingers with her cookies.