OH, dear, I hope someone can give some input here. Our 10 year old cat recently has been pretty ill. He came down with sneezing, coughing, vomitiing, extreme lethargy. He was very sick. A week or so prior to him getting sick, he was at the vet for a routine visit, and the vet said that he had a mouth ulcer and some plaque on his teeth. He attributed the mouth ulcer to gum disease. Our cat has also had an unkempt coat for several weeks; he seems to be losing hair. The vet attributed this to fleas, but we have never seen our cat itching or chewing or licking himself enough to pull hair, and in fact we deflea him fairly regularly. Although he did have a few fleas, he was hardly infested. Anyway, the vet also said when that when we brought our cat in for his illness, he did not have a fever, but I noticed that the assistant who took his temp seemed to be having a problem placing the thermometer. When we took our cat in for his illness, the vet gave him a shot of antibiotic, antinausea med, and steroid., and sent us home. Said to bring him back in 24 hours if he did not significantly improve. WEll he did improve, although only by slight degrees. We decided to wait a bit. He has improved a little more over the weekend, but is still a little lethargic and weak. Appetite is much better and he has stopped vomiting. However, now one of our other cats is catching the same thing. I am very worried that this is FIP. I put the symptoms in Google, and they match. The illness symptoms themselves, but also the unkempt hair and mouth ulcers. Plus, I read that it is a slow moving disease, and that Steroids and antibiotics can help slow the progress of the disease and improve symptoms. I am terrified. We have four cats, and two of those are over ten years old and have been dearly loved members of our family who grew up with our kids. The other two are younger..one is around five or six years old, and the other one (who just started showing symptoms) is around 3 years old. My daughter's kitten died of the wet form of FIP a year or so ago, and it was an agonizing experience for her. (She doesn't live with us). Does anyone have any experience with this, or with a virus that might be showing look alike symptoms??? Lastly, our ten year old cat who got sick first, also is hyper thyroid. If that makes any difference. He's had that condition for a year.