If you are talking about humping, I have an answer. The dog sees you as part of it's pack and is demonstrating that he is dominant over you. He doesn't really expect to mate with you.
it tickls the dog
to the leg its just small scratch
I believe that when Taylor shakes his leg it is a nervous disorder...I have the same one.
Probably it feels ticklish and wants to override the tickly sensation by scratching (which they do with their legs).
My dog does it because his allergies make him itch like crazy, if I were you, I would take your dog to the vet, it could be a rash.
Rub its belly..It is asking for attention.
It means the dog is trying to dominate you and you should definitely not allow that type of behaviour.
I guess she has an itch and is too inhibited to scratch it.
tHEY SCRATCH THE GROUND FOR WORMS AND BUGS.
Maybe the dog is fustrated
It means your dog is going to pee on that person. You know why YOU DON'T TRAIN IT RIGHT THATS WHY IT DOES THAT
Its not bad if your leg shakes uncontrollably. It can sometimes be some sort of an effect if your on different types of medications.
i bent over to scratch my leg