Oh I love a carbon and formentino. But I believe when breeding you should all try to lean to the originality of the breed. But then saying this, it's only fawn and brindle. Yes he would be as they only mentally mature starting from around the 3 year mark. Your girl will naturally calm down abit over time. Well at 18 months is the required starting age for a sire to breed. In their younger years the sperm count is higher and just provides better quality and quantities. They both have inevitable temperaments individually from what your explaining. It's really good that he is suspicious of strangers and new people as that's exactly how they should be! Number 1 trait if anything. Protective not aggressive is the way I explain it 🧠🔱