Q. My cat has started acting strange since my brother brought his two cats around. She won't eat or drink and pukes up white foam. Could it be stress?
DANA KOCH, VMD, MLAS
A. If she's not eating, she could be going into liver failure (hepatic lipidosis). This can happen when cats get stressed (like after household changes) and stop eating, if only for a day or two. It could be a lot of other things, but I would want to take her to a vet for a work up. Hepatic lipidosis is usually very serious. I worry about it any time a cat stops eating.