I worried myself silly last year about my two boys. They live in a shed. I also have an almost 7yr old rabbit who lives outside. My guinea pigs (it was the first bonfire night that I had them) were brought indoors for bonfire night last year. the noise of the fireworks didn’t bother them. For new year when I knew more fireworks would happen, I left them in their shed - the fireworks didn’t bother them. The first couple of bangs of fireworks made them take notice, but after that they just went on with their hay munchkin business and were absolutely fine! Their hutches (as always in winter) were covered with blankets and their hutch cover so they wouldn’t have seen any bright flashes. I think my lot are so used to hearing my children shouting and playing out, the lawnmower, hedge trimmer etc that they settle into sounds really quite easily now. So this year, I’ll cover hutches and make sure they’ve got lots of snuggly hay and hides houses (no different to alway really), will check on them but hopefully they won’t react to them