Dogs humping my dog all the time at the dog park

Question
I have an almost 7 month old black lab who has been spayed since she was about 4.5 months (from the rescue). She's mostly an indoor dog, but she gets walks two times a day plus a visit to the dog park a few times a week. She plays well with other dogs, is very friendly towards all dogs and people. I have yet to hear her growl or snarl, although she will bare her teeth when wrestling with other dogs sometimes. She doesn't snap at people or dogs.

At the dog park, large dogs (neutered and unneutered) often come up to her and hump her. She's only about 40 lbs, and the dogs that are doing this are a lot larger than she is. She gets pinned down and can't move. The owner's don't do anything about it besides sometimes yelling at their dogs, which doesn't really help. A lot of them are like "oh, they will work it out." (Of course, since it isn't THEIR dog that is getting tormented) Is there anything I can do to make these dogs stop? Or maybe the owners can do something? Sometimes it gets to the point where she can't even play with the dogs she wants to play with because these big dogs keep trying to hump her! She won't snap at the other dogs or even growl, and I imagine that's why they go after her rather than the other females in the park.

Answer
There is really nothing much you can do once the other dog is on top of your dog. You don't know if the dog doing the humping is going to try and snap at you if you try to forcibly remove it, so it's best not to try. Instead, you need to step in and prevent the other dog(s) from >>starting<< to hump your dog. You can do this by pushing them away with your foot (not kicking!) or by simply stepping between the other dog and your dog, and pushing the dog away with your presence.

It is extremely irresponsible for the other dogs' owners to allow their dogs to hump other people's dogs. That is one of the reasons I do not recommend taking your dog to a dog park. Your dog is still a puppy, and that is one of the reasons she is not attempting to 'fight back.' However, you don't want it to escalate to the point where she IS baring her teeth at, and/or trying to bite the other dogs, because that could further escalate to her being aggressive to all other dogs, and you certainly don't want that.

If an owner is allowing his dog to dominate yours (humping is dominance), you should politely ask that person to go and get his dog off of yours, and if he refuses, walk over to the dogs and take care of the situation yourself, in a manner that lets the other owner see that you are not going to tolerate such behavior. If the dog is wearing a collar, grasp the collar at the back of the dog's head and lift the dog straight up in the air, holding him away from you in case he decides to turn and try and snap at you. Then, take the dog over to his owner, still holding the other dog's collar (his front feet will be off the ground if you do it right), and hand the dog over to its owner with a smile. The dog may start hacking as you walk it over to its owner, but I promise you are not hurting it, in as short a time as it is going to take to get it away from your dog and back to the owner. You should only have to do this a couple of times to get your point across, and I bet the other owners will start paying better attention and stepping in when their dog starts trying to hump yours. ;^)