If it's just a cold there's nothing the Dr can do as it's a virus so antibiotics won't help. Having said that though, if he gets lethargic or you're worried, get him to the Dr.

Zander is just starting to get over a cold now & we've just been keeping him warm in the house & making sure he's drinking lots. I would have our vapouriser on, but he's in a big bed now & I worry that he'll touch it & get burnt.