Bullmastiff mature

[Renato Corvetto]

Hi everybody, i want to know at what age bullmastiff fully mature (growing and temperament) i own a 19 months old bullmastiff,and everybody talks about how good guardians,protectors,territorials etc they are but so far i dont see any of that in my puppy.I did not get her for that,i was just wondering.She is 105 lbs. is she going to get any bigger?

 

[ElJayBee]

most mastiff breeds can take up to 3 years to fully mature. each dog is an individual, though, some mature faster than others. 105 pounds seems small for a bullmastiff to me. she may fill out a bit more, but prolly nothing over 10 pounds more than she is. is she spayed?