my rat has a new bad aditude

Question
I have a rat that I' have since he was a baby he's now about two years old. He has always been very sweet, but we moved about 7 months ago, and since then he has become very aggressive. I thought that he would calm down once we were all settled in, but he gotten worse. What I can I do to calm him down? please help.  

Answer
Is he a lone rat? Rats that live on their own often develop behavioural problems due to boredom and being lonely. Those in groups dont really tend to. It does sound like he needs neutered and I think thats possibly the only thing that could help. Though his age is something that would have to be considered. If he did get neutered it would be a good idea to try to introduce him slowly to a friend. If not then he kind of faces a lonely life as no one will really want to handle him since hes so aggressive. Good luck