Althea had a similar episode autumn of last year - and we were in the mountains! I called her doctor; we thought it must be a flare-up of her IMHA, so I increased her prednisolone. It took a few days, but she improved. As soon as we got home, I took her in for blood work; her WBC was low, indicating that what she had wasn't a flare-up of the anemia, but a low-grade virus! The doctor said there's nothing can be done but give supportive therapy, and the body will heal. Hopefully, Hunter will be fine in a few more days!