How do I train my cat to stop attacking me?!

Ok so my about 9 month old cat-Leo has been aggressive towards my dog and myself.  And when I say aggressive I mean he attacks us.  It used to be worse because my dog is very playful and would chase Leo, but I have trained my dog to not chase Leo anymore.  The problem is this is my first cat and I have been unsuccessful at finding an effective way to train Leo.  How do you train cats? 

I have been trying to read his body language when he attacks, and it really just seems to be playful.  He does not hiss.  Although his ears are flat back against his head.  And he grabs my ankles with his claws and bites and I have to try and pry him off of me which is extremely painful.  He also loves to get somewhere high and then jump on me.  And he crouches down on the ground in a hiding place and then kinda like stalks me before he pounces, which is cute because he looks like a mini lion, but it is not cute when he bites!!

He is not like this all of the time though.  The majority of the time he just wants to sit on my lap.  But then he has these random outbursts where he just attacks anything that moves-mainly my dog and I.  

All the advice I have gotten is to play with him.  But I play with him TONS and have lots of toys for him, but simply playing with him to get out his energy does not seem to work. 

Does anyone have some concrete training techniques I can use to correct this behavior? Any advice would be much appreciated!!

I don't know if Leo was a bottle baby or an orphan, but there are things one has to do with an orphan to teach him NOT to bite the human or actually grab with claws, and usually those lessons start very young, 6-7 weeks.  I just wrote someone who was experiencing this with a 7-week old, so I will give you a link to that thread rather than repeating it.  Your kitten is already 9 months, but it sounds as if this may be a new behavior?  Or maybe its something he always did but it didn't matter when he was littler so you never trained him NOT to do those things.  Try some of the techniques I explain in the thread.  Also, make sure his claws are clipped on a regular basis.  You are definitely going to have to become the mama cat, or alpha cat, so he respects you.  He doesn't mean to hurt you, he is just playing, but he needs to learn how to play fairly, and that means he needs to lose a few battles. It sounds like you dont have another cat to teach him the rules.

http://www.thecatsite.com/t/319860/normal-kitten-behavior-aggression

Thanks red top rescue! I read the other link and their problem sounds similar to mine although to maybe a lesser degree.  And I forgot to mention that my cat also often does the arched back halloween thing too! Sometimes it seems as though he is scared of me and arches his back and scampers away from me. And it's funny mine is a siamese mix too!  And I don't believe Leo had much time with his mom. They found him somewhere with his siblings without a mom. Somehow they had managed to survive a while without a mom.  Someone rescued them from a high kill shelter and then we adopted him!  Unfortunately his other siblings were already adopted and one kitten is what is best for us right now.  And this behavior is relatively new.  It's been maybe about 2 months that he has been doing this.  I will try the stuffed animal  thing.  All his toys really  things he can chase and not wrestle with.  Also I cut his claws as often as possible, but he is very feisty when it comes to that.  Any advice on how to make him not claw me to death when I try and trim his nails?