I have an 8 yr old Siamese, no previous health problems apart from getting in the odd scrap. On Monday night we noticed he had a very slight wheezy cough and we put it down to a possible hairball (although he has never had a problem before).
DH got home from work yesterday and found him laying on the back of the sofa, with very quick but deep breathing. He didn't want any food, and didn't want to move. He was trying to sleep but clearly was unable to settle. Before bed I wrapped him up in a blanket and put him on my pillow (we totally spoil love our cats as you can probably tell). In the morning he seemed perfectly well, he was running up and do the hallway screaming for his breakfast. Dh went to work after me and said he was still coughing badly and quite often but otherwise seemed fine.
I have got home tonight and he now seems worse than last night. I placed my ear on his chest and it sounds like he is hyperventilating. He has also started dribbling from his mouth. We can't think of any changes in the house which could have cause this reaction, and anything that could harm him is locked away. We did wonder if he has been spooked by something as he is a rather sensitive would, but this does seem an extreme reaction and doesn't explain his wheezy cough. Also, he is kept in during the day as we don't have a cat flap, so he couldn't have got hold of/eaten anything whilst we were working.