IME it could mean anything...personally I would not consider a dog to be needing an experienced owner due to size or strength. It would be a personality thing.
I have used that word often. What it could mean if I used it are any of the following:
- a dog that is not good with other animals - a dog that has a fairly confident or dominant personality and needs someone who is comfortable in the alpha role (this is usually what it would mean) - a dog that's extremely smart - a breed that just isn't a great beginner breed eg ACD, APBT/AST
Or any other personality/temperament trait that could potentially make it a bad match for someone who isn't overly experienced.
We've had dogs come through that are great, wonderful dogs. In the RIGHT home they are dream dogs. In the WRONG home they are very much problem dogs. Two that stand out in my memory are herding breeds that came from bad backgrounds and were lacking in confidence. Both of these boys desperately needed leadership. If they didn't feel it, they would take the reins and basically try to protect their person and themselves from anything and everything. One dog, a Belgian, had been through extensive obedience and was literally a dream dog as long as he understood that the person was 'alpha', and would make the decisions. If he was with people that were at all nervous of him/with him, he felt it and became protective - onleash manners were like night and day depending on the person at the other end of the leash.
Another that's coming to mind is a gorgeous APBT type named Sunshine. She's just a goofy adolescent who LOVES everybody and everything, and she is on a trial adoption right now, which has been extended b/c the adoptors are still trying to get a handle on her. She's just SO MUCH DOG. She is smart enough to take a yard if given an inch, and though there is NO aggression in this dog (I mean PEOPLE-LOVING) she will mouth and jump up. The owners are great, their last bulldog just wasn't as much larger-than-life as Sunny is. They just love her too much, and they have to work on not spoiling her so much. They know it...I am pretty confident that this will work out.
Jen Barlee's Angels Rescue Network -
http://geocities.com/barleesangels Barlee, forever in my heart Until there are none...rescue one