Help! Aggressive Puppy! What to do!

Hi. I have 3 month old Yorkie... He is very Aggressive and I have never had a dog before so im not sure how to discipline him or correct him on this... He is constantly nipping, barking, and humping everything & everyone... My local vet has made comments about the behavior but aren't much help (and sorta rude) soo i need help on ideas on how to reward his good behavior and how to discourage his bad ones... He has already been neutered and the vet said it would calm him down but that hasnt happened yet... He is crate trained and almost never has accidents in the house... AHHH please help!!! thanks Brink's mom!
(email me at kmh1014@aol.com!!! thanks in advance!)

How old was this puppy when you got him?

Here is an article on puppy biting and mouthing - hope it helps!

And congrats on having a Yorkie puppy who is nearly housetrained.;)

Puppy biting (http://www.scvhumane.org/behavior/dog/mouthing_pups.htm)

3mon old already neutered and house trained?

:D

Can you give us examples of what you deem to be aggressive behaviour. As specific as possible pls.

It sounds like he is a very dominant dog. You should enrole in obedience classes ASAP. Tell him to sit before he gets any attention, or any thing fun. Make sure to leash train him so you have more control over him.