Someone forgot to tell Buster that Saint Bernards make worthless guard dogs, they're typically too friendly for the job. This was totally unexpected of him, especially at only 5 months old. He normally greets everyone (family, friend...total strange he's never seen before) with a full body wag, my boy hasnt learned to wag JUST his tail. A few nights ago I was taking him out for his bedtime potty walk. Right around 10pm I put Buster on his 20' leash and we start to head out the door...just like we do every single night. Buster froze just inside the back door, completely refused to budge an inch, which is anything but normal. So I look to figure out what the heck his problem is and theres someone in my yard! Male, late teens-early 20s, out near our vehicles. He must have heard the door open and started walking towards the house. Instead of his full body wag, Buster is standing completely still, head and tail held high, looking very alert. The guy catches sight of the puppy and takes off at a dead run, his buddy that was standing just out of my line of sight joined him. Lucky for me no one told these guys Saint Bernard PUPPIES typically make worthless guard dogs! This wasnt a matter of him feeding off my fear/emotions. I thought the guy in the yard was my brother in law...I really need new glasses. I couldnt say what Buster would have done had the guy come all the way to the door, Ive never seen him react to someone this way...its ALWAYS the full body wag. Buster didnt show any aggression, no noise either (not unusual, he's a very quiet puppy), he simply stood completely still and alert...he made no move to give chase when the guys ran off either.