I am a first time rat owner and got 2 rats just under a week ago from a pet shop. They both seemed fine at first but about 2 days ago one of them started sneezing. He seems to be sneezing pretty often now, both when he is in and out of the cage but mostly when he's moving around. He's completely fine other than that, he's still got a good appetite, is very energetic, his breathing sounds normal and we haven't noticed any porphyrin or anything. We use a mixture of bedding in the cage with the base being covered by carefresh small pet bedding, the house being filled with safebed paper wool and the litter tray being filled with back-2-nature small animal bedding, all of which was recommended by the pet shop as the ideal bedding. I've been doing some research about what it could be and I've seen that it could be due to it being a new home but the sneezing didn't start on the first day we brought them home, does that rule that out? Just worried because this is the first time I've had pet rats and I don't want to miss a respiratory infection!