I have a 2 year old Mastiff/lab that we've had since he was 3 months. Old. He has always been territorial, doesn't like people coming in the yard or touching the car when we are in it... of course if were not in the car you could break in and he lick your face and wag his tail. He has never liked it when strangers approach one of "his pack" but was always okay about it once introduced... Now that you have an idea of his disposition here's my problem... I have been watching a 2 year old boy for about a year now and just recently... like within the last few weeks my dog really doesn't like the boy... a couple months ago they would chase each other around the yard and house and have a ball and now... the dog grumbles when the boy tries to love or cuddle or even chase him around... and the dog really doesn't want to do anything but come cuddle with me whenever the boy is around... how do I get the dog to stop being jealous and go back to liking the boy again?? Any help would be really great. Because now I have both of them following me around vying for attention.:confused: