hello..i recently adopted a Great Dane..he is 1 year and 7 months old..he was previously not living in the best of circumstances..he unfortunately had to be seperated from his brother that he was raised with..(his brother tried to kill my female saint bernard mix). I have 2 other dogs, a female Saint mix (almost 2 1/2 years old)..and a male pure Saint Bernard(14 months old)...we have introduced him in small increments to my other 2 dogs...let them smell each other on walks, etc...let them smell each other through a baby gate in my house.(and there has been no problems)..so today we finally let him in my yard with my female.....she was a bit weary(after his brother attacked her a week ago)..but then they started to do the puppy play bows...running around..etc.....but... when he tried to play to rough with her..(and also) when he tried to dominate her..(by putting his head over her back, and certain postures)..she flipped on him..snarled and snapped..and he backed off VERY quickly....she only had to correct him a few times...and they were okay...now....my concern is my male..(i believe my female is the dominant of the 2 Saints..and thet get along wonderfully..)..how do i introduce a new male to my male?....i hear it can be very tricky..and its VERY important to me to do this correctly...so i can keep them all..i dont want to have to re-home this Dane...(he's been through enough already.)..please..please..give me any advice!!...thanks so much..Wendy