Socially Inappropriate Behavior

Now that he is two it could just be a maturity thing, dominance or habit.  Irritation or itching in the genital area can cause both male and female dogs to hump in response to the physical sensation. Check with the Vet.

 Is he doing this at home, or around your house?  There may be a female in heat somewhere around you and it will go away.  Or it may be excitement.  Sometimes, my Duffy air-humps.  I do not think it is voluntary, so we just wait it out.  It doesn't have anything to do with dominance for Duffy and I doubt it is the case for your dog.  Hopefully it will stop as he gets older.

I've seen years-neutered males do this at dog parks. IMO it's simply a response to extreme happiness or excitement in general. I don't think it's dominance AT ALL but an involuntary reaction brought on by extremes of emotion. He may grow out of it...you perhaps can have him sit down or go to his kennel until he is calm when visitors are over to occupy his mind. Might also consider giving him a toy everytime visitors come to redirect...he can shake that instead.

humping is a perfectly appropriate dog behavior it's just humans see it and attribute it to all sorts of weird things like "dominance" and "sex" when it's usually simply play or an over-excited dog trying to call himself down. Working with your dog on self-control behaviors like stays and "leave it" and sits under exciting circumstances can help your dog refrain from getting over-excited.

On o Primo used to this when he first came to stay with us. He was fixed as a puppy but he was 3.5 years old by this time. I agree that it is a mixture of excitment and maybe a littel uneasyness of not knowing his place.

I halted the behavior immediatley because I didnt care for it nor did I want it to escalate into actual humping of humans. In our home I would make a "ssshht" noise in conjunction with a tab to his side and redirect him to his bed. Guests were asked to immediately withdraw from petting him if he did this. In public I would regin in his leash, with the appropriate "sshht" noise and make him sit.

Its just weird and I dont like it, LOL

I'm so glad to know that it's not just him!!!  I was about to give up & blame it on him watching too much MTV! He doesn't seem to be just uber excited when he does it. It's usually after he gets tired of being petted and licking the children and wants to hang back and watch. So far, it's happened in the house and outside in the neighbor's yard where he is not allowed to go without us.  He's out in the yard frequently with us & doesn't have this problem without the extra mental stimulation of playing with the kids, so I don't think it's a female in heat anywhere causing him to do this. I hadn't thought of having him sit or do something else. We'll try this and see how it goes. Thanks for the advice with my little hooligan!

Consider yourself lucky - at least your dog doesn't lie down and "spread 'em" when she is asked "Are you a hussy?"  Yup, that's my Sequoyah, a real s&ut dog LOL.  She does the passive submission thing a lot, so we put it on cue.  Baaaad humans.