
Originally Posted by
Curbside Prophet
It's a behavior used within a dyad as a show of dominance, perhaps.
When the dog does a behavior like humping his owner (out of context behavior) it is a displacement behavior, and that's all we really know. There is no scientific proof that rigid hierarchies exist among dogs, especially among puppies (other than Dunbar's bone test in the 70's which disproves the rigidity of linear hierarchies).
So to call it dominance, really, is just a construct, and serves no purpose. It would better serve the OP to understand the antecedent of the behavior than guess what's going on the dog's mind. If you can control the antecedent, you can control the behavior, and that's all that's really important IMO.
Let me give you an example of a similar problem a friend of mine had. My friend has an in home business, and she chooses to work in the evening. She spends the day with her Yorkie, and her husband puts the dog to bed every night. She had complained about her dog's "odd" humping behavior in the evening. Curious, I went to observe. I learned of their routine, where the husband crates the dog at night. So as I'm watching, her husband enter the room, and the dog starts humping my friend. Coincidence? I asked the husband to leave the room and to try again while I distracted the dog from humping her with a squeaky toy, then let the dog play with the toy on her own. Husband returns and guess what? She goes back to hump my friend.
Selective dominance? I suppose you could fabricate a story that when the DH entered the room she felt threatened by the DH, thus claimed my friend as her own. You could tell these people they need to discipline their dog, and show her who really is "Alpha". Or you could do what I suggested to them...instead of DH crating the dog at night, my friend could end the humping behavior if she crated the dog herself. No more problem.
In the OP's case, it's very likely the dog sees lying or sitting on the BF as an opportunity to play, and humping during play is common in dogs. Who knows, but the OP seems to know what environmental cues cause the behavior, so if you can control those environmental cues, you can control the behavior. Either by giving the dog something else to do before sittin or lying on the BF, managing the dog, or sit on the BF at another time.