Hey back - Glad I could be of help. Argentine Mastiffs don't get as big as the Bull Mastiff (think this is the type your folks have from the weights - OMG!!!). Males generally run 25-27 2/12" @ withers & weigh between 90-120 lbs with a very strong/muscular build. They mature slowly (males are considered adults somewhere between 2-3 years of age), Tango has just begun coming into his own lookswise in the last few months - chest/head development mostly. He stands about 27 1/2" and we're guessing he weighs about 110 lbs now (more than me!!!). I'm a bad mommy, haven't posted any pix of my "boys" on this board as yet, hopefully, I'll get to it soon. We brought Dempsey home @ 9 weeks (Tango was about to turn 17 months old) and they got along famously from day one; even though they each have their own bowls, many times both of them will be drinking from the same bowl at the same time - I need to buy stock in a paper towel company the way I go through them mopping up the spills! I'm sure that Magoo & Hank will get along well too.
Penny