Personally, I've never had my dogs neutered and have never had a problem. Well thats not entirely true. A Jack Russel terrier that lives 2 doors down would cause Tango to become a little restless when she was on heat. He didnt stray, but she did. She got into ourngarden, took advantage of Tango then waddled off home leaving him laying on the grass looking bemused. The result was a collection of jet black, long eared, short legged Jack Spaniels. But they were lovely.
I would anticipate that like me, if your dogs personality is one which you dont want to cahnge then you probably wont want to risk it changin by neutering.
Over to you
Stu