Good question and interesting answers.

Sammy- TERRIFIED of thunder.
Leroy- Not smart enough to know fear!
Stubby- Fearless but avoids strangers.
Lucky- Absolutely everything and Maggie Sue.
Peanut Butter- Strangers, loud noises, and Maggie Sue.
Pete- Strangers and Maggie Sue.
Pepper Jack- Most everything and Maggie Sue.
Pervy- Strangers and Maggie Sue.
Maggie Sue- Her daddy.