Guarding behavior is interesting. The common one, guarding resources (food, bones), seems simple enough to understand. When it gets to territory then it's more complex. Why does that dog want to keep me off the couch? In my case, that dog was DH's AmBull and me even being in the house in the first place might have been the issue, lol. But she's a very social dog, so she loved the added attention I brought. Somewhere I crossed the line from 'welcome friend' to 'get lost loser' and the couch/bed was where it happened.