How do I stop my dog from humping my kids' friends?

Humping isn't a sexual thing, it's a dominance thing. My male boxer used to do the same thing to kids so here's what I did. I gave the kids treats and then had the tell my dog to sit (or down or shake or whatever) in a stern voice. When the dog obeyed he got the treat. After a few times of this he recognized that my friend's child is higher in ranking than he (the dog) is and he'd never tried humping him again (the dog that is ;o) ).

Hope this helps

If he is trained, give him a command he knows well and praise/treat him profusely when he does it. If he is not trained, you'll have to do it the old fashioned way. A firm "no!" and pull him away. Give him a toy or play with him. Repeat if needed. If after three tries he continues, then do what you have been doing -- to the basement (dogs don't learn overnight) but repeat the next time there is a visit. He'll get the idea. Smacking him could bring an association of neighbor's kid and bad things and could lead to him threatening the kid in time so, while it might work, it is not worth the chance.

Added after additional answers appeared: Sahmlam's idea is excellent too - it's really the same thing but, again, does require a trained dog.

Dont smack the dog whatever you do. I have had German Shepherds for over 30 years. First off he is doign this as a sexual thing, kinda claiming his territory. You need to get him neutered. Then if he continues, get a squirt gun full of water and squirt him and tell him NO in a stern voice. You can also try canned air just spray it at him, it scares them good and its harmless, although dont spray him in the face. You can also use a coffee can with a handful of change in it. Tape the lid on and shake it real loud at him and yell NO. He will get the message. This is a very common thing that can be resolved very easily. The coffee can of change I find is the best method. Good Luck,

If spaying or neutering doesn't help it's because your dog is showing that it is the Alpha or dominance. Try a spray bottle full of water when you see it mount up squirt it see if that helps.

You should get your dog neutered or spayed.

Or you can just command the dog to stop.

Ive had a dog hump my leg before, and it is not a good feeling.

hope this helps in some way!

as soon as you it start it smack it and tell it no then if you have a kennel put it in there for 5-10 mins