I have a NEUTERED male dog (Pekegnese/Jack russel) who will be a year old December 1st. He has never showed signs of aggression towards people or other animals. He got neutered about a month ago, and since has had major food aggression, and aggression to any other dog i may pet (this is definantly bad at the dog park!) He is up to date on all shots, and he is acting just fine in everyother way.

Does anyone know why he might be acting like this?, or how i can put a stop to it?

Have you considered seeing a trainer?

I'm with Sariss on this one...
Seeing as how you had aggression problems with your last dog it might be time to enlist professional help ;)