Cod liver oil works pretty well too, just a teaspoon over wet food or raw.

This is of great interest I think - it's about mixing raw and dry, and perceived different digestion rates. I found the following information while doing a bit of further research on the raw/commercial debate today.

1. Meat is NOT poison. (buzzards evolved to eat poison, i.e. spoiled meat, road kill...) Raw meat does not always carry bad bacteria. Meat that has gone bad, is stored improperly, is sick, etc. etc. can harbor "bad" bacteria, yes. But generally speaking, those suppliers who sell raw meat for consumption do NOT sell bad meat. (And most kitties are smart enough not to eat it.)

2. TRANSIT is not the point of digestion. ASSIMILATION -- that is, absorption of nutrients, followed by disposal of non-needed products -- that is the purpose of digestion. It is true that kitties have a digestive tract shorter than humans. (We might expect that, given our size difference.) And that short distance means a "bad" bacteria will be sent out before it has a chance to find a home inside kitty. However, TIME is not the key. BIO-AVAILABILITY is the key. The reason that kitties digest raw food well is that it's in a form that is more available to them, i.e. it's bio-available. Kibble is just not natural. Compare the french fry to the potato. Which do we digest better?

3. We people are smart enough not to try to deliver a full meal of both kibble & raw at the same time. Transition means trying a little here and there. So putting a 1/2 tsp or so on the plate with the kibble just isn't going to have a chance to do serious damage.

4. Our bodies, and all of nature, are much, much smarter than we assume. "Bad" bacteria will not be absorbed unless the environment of the kitty's body will support it. In other words, if the kitty is healthy, and they eat bad food, you can expect them: to vomit, have diarrhea, or just poop it out normally.

5. Lastly, some people apply principles from macrobiotics and ayurveda and other people-food rules to CATS. I'm not sure that is a fair comparison. We will get gas if we eat fruit after eating meat. But, given the physiological differences between humans and cats, can we say the same rule applies? My gut says "no."

So, it seems I was wrong to be concerned about different 'rates' of digestion. I have lots to learn about the subject!

Also, about fish, this: Little Big Cat