We have a cat who was throwing up blood several months ago ...we could find nothing wrong with her ....she seems better now ...how would I know if it was related to her food?
Were you feeding the cat any of the recalled foods.
The vomitting and blood is one of the symptoms.
go to http://www.petconnection.com/ and there on the blogs it tell you what all the symptoms are.
Even if the dog or cat gets bad breath, blood in stool, excess water drinking, etc.