we have a 2 year old border terrier. on his first ever bonfire night, he was a tiny puppy and we lived in a densely populated area with lots of fireworks. we just cuddled him all evening- he was fine.
last year we went out to a small local display and left him alone- aged 1. btw, we had move by then to live in a very quiet area on the edge a village so fewer fireworks.
this year, i'd like to go to a display/bonfire in a nearby village, which would mean being away from home for about 4 hours.
my question is this .... is it likely that my dog could react differently to the fireworks this year, even though we have had no history of being frightened?
if he is frightened, have read somewhere that if you make a fuss of them, it can reinforce the fear... so is it better to be around or just leave him to it? 
would it be unkind to leave the dog alone for this length of time, dyou think? we would leave radio/ music on for him.