In the last couple of weeks, both of our cats have started to develop dandruff on their backs. They’re both 6 years old, one short haired, the other long haired. Fed the same thing as usual (dry food), both mostly live indoors but have access to the outside. They have access to water at all times. They don’t seem to be itchy and have no sore or bald spots... can anyone advice what it could be due to and what can we do about it, since we probably won’t be able to get a vets appointment any time soon, please? TIA