If Meow Meow's vomiting food like this five hours after her meal, that might be a little slow, which might not be unusual at her age; it's worth asking the vet. This article mentions "a few hours" for emptying; that's about what our vet said. It is so complicated to sort all these things out, what with foods and habits and the digestive system's various organs.When she vomits its all her wet food so brownish, in a brown carpet..... Last night she did have a few bites of dry after the wet and that came up with it as well. Meow Meow is around 15 to 20 can't remember where in between the vet said. When it comes to food Meow Meow is one of the strangest cats I know. She eats until shes had enough then walks away, so if anything she under eats some times. Even if her tummy is emptying slowly I don't see as the problem. I've never know another cat with this type of self control.... Shes really upset with me right now for no wet food.
One of our cats (the one who has had a tendency to get constipated) also eats only until she's full, then walks away. And then the other cat wants to finish everything!