Filas usually mature -- behavior-wise -- quickly. They pretty much know what they are right out of the gate.
They typically hit their first heat at around six months.
Physically, females aren't
matured, filled out, etc. until they're about two years old -- and you might not really see a total, physical specimen until you're between two and three years ; males a little longer.
But it hardly matters, lol. A seven month old Fila bitch is a load and a half
Kharma stood off a 2000+ pound bull when she was six months old. OJ decided it would be less trouble to go AROUND the blackberry bramble instead of through the pathway where I was picking blackberries. Poor OJ, lol. Life was never the same, although the two of them developed a good working relationship over time.