Vets always tell you to separate but rat owners usually know better. Any rat that they lived with has already been exposed , so there's no point separating if its so they don't "catch" it. Rats often are more stressed and depressed when taken away from their cagemates and are happier and heal better with their friends. I only keep them separate in times of injury, or if someone is picking on a rat that is ill, or if the rat has had surgery and someone's paying a little too much attention to incisions/staples. Other than that they stay together and I often put a rat right back in the cage after surgery, observing things at first of course.
I would keep her with her cagemate. We also usually don't tell our vets that we do this...hehehehe.
I would keep her with her cagemate. We also usually don't tell our vets that we do this...hehehehe.