rat allergies

I hand raised my beloved litter of fancy rats, born on December 9th of 2019 and had a perfect situation - all of the baby girls live with their mother and the one boy, Herbert, has been living with his father, Gerard. Unfortunately Gerard is an old rat and once he passes on I will not be able to...

Someone I know is having troubles with their rat(their rat is on meds). The problem is deep sneezing. I was wondering if it could have anything to do with their pet cats.