We want to open up a dialogue about cats and vomiting. 

Why do cats vomit.  When should we be concerned?

Report vomiting with certain food brands and wet or dry food or raw.

Is it digested food, undigested food, clear, foamy, yellow-bile, time of day, relation to mealtime?

KD pukes much less on wet food than she did on dry. This despite her CRF which is supposed to cause more vomiting.

Every cat I've ever had has eaten at least some dry food, and I've always considered some random vomiting to be "normal." But seeing how infrequently KD throws up now that she gets no dry food, I wonder how normal it really is. I'd be especially curious to hear from raw feeders as to whether your cats still vomit randomly.

My five all vomited much more when eating Hill's and Purina dry foods. Since switching to a combo of Wellness dry and wet, Sheba, and Tiki Cat, the vomiting has really decreased. Gidget, my male calico, used to have bouts of vomiting bile and generally feeling lethargic, but those too see to have passed (knock on wood). My one hairball machine (Yoda) has even let up quite a bit.

With my three, I give a variety of good canned brands such as Wellness, Pinnacle, Merrick, Newmans, etc and dry Wysong. Now that they no longer eat Nutro(canned or dry), their now much rarer (knock on wood) vomiting can usually be traced to their individual cat-habits.
My oldest cat, a kibble freak, is often "Mr.Wolf-It-Down". If he gets enough of an over-portion and too fast, he will vomit it up. Rarely there is a hairball as a cause. He likes plastic and other contraband, though, and that will result in yellow bile? coming up with the plastic. He is about 13 and probably intractable in his ways.The "middle child"(8 yrs), an overweight Garfield-look-alike, eats everything (and he would eat till he fell over if given the chance) practically never vomits. The one time I remember watching him puke, he was as surprised as me. The cat was actually sick and ended up on on antibiotics that one time. The "baby" cat (6 yrs)vomits occasional hairballs. What gets me is that if the older one vomits actual food, the youngest one likes to "go after it".Gross.  
Meowli

I have two cats: Kaffe will be 10 in January and Cato will be 2 in February.  Neither cat is what one may call a "vomiter."

Cato is a long-haired cat and to date, has never had any vomiting due to hairballs or eating too much too fast.  The only time he has ever retched was the two or three times he ate too much yard grass... the vomit then was mostly foam and the tell-tale blades of grass.  His diet consists of 90% home-made (80% raw and 10% cooked) and 10% commercial (kibble).  He has never once vomited any of these foods.

Kaffe has had memorable vomiting bouts in the past - but also so infrequently that I remember them.  The first time was when he was 2 years old and he deposited half-digested food vomit with one huge round worm still squirming in it.  He was wormed and there was no more of that.  The second time was when he was 3 years old and he ate a dish of mackarel and rice too fast, he spewed it all up within minutes of finishing the dish.  But he wanted to eat again, so I offered him something else and he was fine after that.  It never happened again - I guess he learnt not to scarf down his food.  The third time was when he was seven years old and he ate 9-Lives tuna at my brother's house.  He vomited several times that night - a very dark brown liquidy mess which was really hard to clean up.  Never gave him 9-Lives tuna after that.  These are the only real "memorable" vomiting episodes that Kaffe had.  However, in the course of any given year, he would on occassion hack and retch up foamy liquid with tell-tale blades of grass when he has been out on the lawn nibbling new grass.  But this is also a very infrequent event.  Kaffe is also on 90% homemade (80% raw; 10% cooked) and 10% commercial wet (He disdains kibble).  He has never vomited any of these foods.

So... from experience, I would say my cats may vomit becuase of:

1. worms
2. eating too fast
3. food coloring, or preservative or other synthetic chemicals in a cat food
4.  grass

I have three cats ages 16, l4, & 5 years.   Really the only time that they  vomit is from a hairball.   Also, my l4yr. old male will do it if he eats too fast.   He can be a pig at times.   I feed mostly canned which I place in a bowl & mash up mixing in the juices before I serve it to them in their bowls.   I think that the mixing may help prevent any vomiting.   

I have 2 cats. Peanut is probably somewhere between 17-20 years, is the vets best guess.  She was an adult when I adopted her so it's hard to say.  Tigger is 11 years old.  Before being exposed to the recalled food my cats only vomited because of hairballs or when eating cat grass.  Their kidney function was effected by the tainted food and I think they both suffer from feline acid reflux.  When they vomit it is usually between 3am & 6am when stomaches are empty and then they vomit liquid, foam, hairballs & whatever little food may be left undigested.  The more alarming part of this is sometimes Tigger will vomit quite a lot of runny liquid and undigested food early in the morning when she should not have anything left in her stomach.  That is when I freak out and suspect that there is something wrong with the food.  I recently reported some of this in the Cat Food Experiences by Brand, Wellness canned thread.

Have had much less vomitting and IBD symptoms since getting off SD dry and wet and Iams
wet products. Even had vomitting with SD KD. Now using Strombeck renal failure recipe home-
cooked and occasional Wellness turkey and chicken. IBD symptoms in one cat of chronic
diarrhea stopped. Still get occasional hairball and infrequent ate too fast vomitting in one cat.