I am a little concerned for one of my cats Ella, she was fine all day sleeping inside on the couch, as it was raining here and all the cats were happy sleeping inside, then she did this big yawn and snort, at first i just laughed as i had never heard a kitty do that before, anyhow she was fine until this evening, she started snorting all the time until she fell asleep again and stopped, is she ill? does it mean she has a cold or what, or something stuck in her nose, i have no experience with this and so i am hoping someone here can give me some advice, she is eating and drinking normally and seems ok otherwise, but she has never done this before, should i be concerned?