Can an indoor only cat catch a cold if he hasn’t been around other cats? We have 4 cats and we did move about a month ago. One of the cats has been sneezing, coughing, lethargic, and has a fever. How could he have caught a virus if he was in his carrier the whole trip, has never been outside, and only has been around my other three cats his whole life? (he’s about a year and a half old). At what point should I bring him to the vet? He ate some wet food tonight and is still happy to get snuggles, but he’s not himself. Will it just clear up on its own? Thank you!