So I'm fairly certain my guinea pigs have mites as they've been scratching and biting themselves and I was wondering how long mites can go untreated because I've already made an appointment with the vet for Friday which is five days away (Sunday in Australia) will they be okay for five days? They haven't had any hair loss or any other symptoms, just the scratching and the biting and it seems to get a little worse every day, the scratching has become particularly frequent, they scratch every 10 or so minutes for about half an hour and then stop for an hour or two and then start scratching again. Since the vet is an hour away I had to be reasonably certain that they had mites before I made the appointment, I'm just a little worried that something will happen to them if they go untreated for the next five days. I've heard that Ivermectin can be used to treat mites but as far as I know, that can't be bought over the counter here I need to make a consultation to get it and Friday was the soonest I could make one.