The Administrator from the Great White North, eh?
Join Date: Jun 2006
Location: Northern British Columbia
A six month old does not get to decide who is allowed in the house and who isn't, Schutzhund training or not. Your dog should be deferring to your in these matters, and you need to up your control of the situation.
This behaviour is a mix of resource guarding (standing in front of the kids), and fear (barking at strangers that you have welcomed into your home).
For now, this is a situation that you need to manage - I would crate the dog if people come over, and give him time to get used to the person being in the house, and seeing that their presence there is normal, and then see how he acts once you let him out. Being out loose with company is a privilege he needs to earn. I wouldn't worry about correcting the barking - dogs quickly figure out in what situation barking is okay (SchH training), and when it is not (having company over).
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Keeta BH, OB1, TR1, AD
Rottweiler/Hairy Dog mix?? 2004-2015