As it was the floof's birthday this week I thought I'd treat her to some wet food (she usually has prescription dental dry food). She has eaten a small amount and almost immediately after vomited up some clear odourless liquid. She gets very hungry so eats fairly quickly (on a diet unfortunately for her as she's a little fatty) and has vomited up almost whole pieces of kibble previously on rare occasions but this is the first time I've seen just water. She's a 10 year old British shorthair - is this something to worry about?