Yellow vomit

Our Jeffrey has just produced a significant amount of yellow vomit (the colour of butter). He seems fine otherwise, but hasn't eaten much today. Any ideas, should we be worried?

The only time i saw this was when Rosie had just been spayed and she was a little sick afterwards due to the anaesthetic and not having any food on her tummy.

I don't know if it's the same as us when were sick on an empty stomach and the yellow stuff we bring up is bile?!

Others may know something else but i hope Jeffrey feels better soon

Sounds like bile. Unusual there's a "significant amount" if the stomach is empty. Have you had any hairballs coughed up before? Hopefully it's a one-time event, but if it happens repeatedly, I suggest going to the vet. The worst-case scenario is an intestinal obstruction.

This is exactly what just happened to one of my female cats. She has not had any surgery recently so no post-anesthetic response. I'm concerned because she has been hiding under the bed for the past 2 days except to come out and vomit.

And the consistency of her vomit is very thin, almost foamy. No food particles, no foreign items, no hair. I think I'm going to have to take her to the vet. Any ideas? Has this happened to anyone else?

Yellow vomit is bile which can come if the pet hasn't eaten for awhile.