Welcome to the Forum. It sounds as though this 'protectiveness' has been going on a long time. I agree that probably it would be best to get help from a behaviorist but make sure that they have experience of Basenjis. In the meantime keep him away from your guests. It's possible that he's stirred up by the excitement so it's best to try to keep him calm when people are around.
Hello
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@Tp3:
Yep Max is all basenji and he loves to lay in the sun.
I reread your first post and I think I saw where I got my wires crossed at Max/mix. Haha, never mind me.
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Max was 4 months old in this video. Shepherd was 1 year old & today Max & Shepherd are good friends.
http://www.youtube.com/watch?v=VsmOa8iRDQo&feature=youtube_gdata_player
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Great video! I miss the soft Wisconsin grass!!
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I'm still happy I fond my basenji…