Some of my furkids barf up what they eat, but this is usually caused by something indigestible in their tummies. Do you feed them green grass? I have found that a few blades of green grass helps them digest or to barf up indigestible contents in their tummies. Tiger had a problem of barfing up whatever I fed the others with, until I realized that she had sensitive stomach syndrome. I have been feeding her for the past 1-1/2 years, kitten chow with a little canned food mixed in. Also, I have to feed her separate from the others because she will not compete for her food when they come uninvited to eat her meals. Some cats will barf up their food when they have hairballs inside of them, especially when the weather begins to warm up and they start shedding their winter under-coat. This can be remedied by purchasing "hairball" control food for them.