I've heard that Mastiffs are very good dogs. How large are they now?
Gimme a couple days and I'll get a pic of them... at 19 months the male is probably 155#, and the female 125#.
I think they keep growing until they die, with most of the constant growth being in the chest. My last oldest one died at 8 1/2 years old, which unfortunately is not uncommon for Mastiffs, and he went from his typical 170# size in years 3-6 to probably 205+# at the end.
These two really tested my dog-rearing capabilities, I think because they're bro/sis. But I focused on them hard at about 7 months old (a li'l late) with nightly walks and sit/stay/come training and they're finally manageable!
TX for the interest. I live and breathe electrical, day in and day out, so it's fun to talk about dogs!!
John M