Cat1 was outside this morning on the side windowsill when I got up. I went to open the back door for her and heard retching before she came in. She wasn't her usual vocal, nosey self and slunk upstairs, retched up some saliva (tiny amount) and then went back out.
She came in half an hour ago and seems out of sorts. She's under the bed (not totally unusual but she would normally say hello first). To my knowledge she's not eaten today, which is not like her.
I thought I'd give her until tomorrow before contacting the vet, and remove the food so I can be sure what she is and isn't eating, although Cat2 will be cross. Does that sound reasonable?