Neutering him could possibly help.
But being an akita, and since he is coming into maturity I'm guessing he's now starting to show the akita's tendency to not always get along with other dogs. Some dogs, even if properly socialized when puppies will, once they hit maturity, not be able to be trusted around strage dogs anymore. It is a commen occurence with breeds that have strong personalities and tend to be dominant.
If your dog gets along with most dogs, you can always watch to see what dogs may be a problem and remove him if necessary if those types of dogs are around. Another dominant dog would be someone he would be most likely to get into a tussle with. Any dog that comes up to him stiff legged and gets right up in his face trying to stare him down would be a big clue. Raised hair on the haunches and down the back after greeting could be an indicator as well, depending on the dog.
I hope you can still take him around other dogs. You may just have to be more cautious as to what types of dogs he will be able to be around. Alot of akitas are same sex aggressive so maybe meeting with female dogs may be an option for you.
Good luck, and welcome to the board.
