Diarrhea and Wet Food..

So after eliminating every other possible cause, I am coming back to the idea of my cat's food.  Until June or so of this year my cat at mostly dry food. He did eat about 1/2 a 3oz can of wet food mostly to get him to drink water. At the time, however, I minimized wet food because I believed my cat had renal issues and non KD wet food should be kept to a minimum. In late april he tested ok for renal issues and was giving a clean bill by the vet to go full time on the wet food.

Then I started feeding him mostly wet food. 3 oz of wet food in the morning and three at night.  I added a little more wet food.   After 4 months of this, my cat had a diarrhea explosion.  Which persists to this day. My suspicion at the moment is that there is something in the wet food that doesn't agree with him. But, when he was getting small amounts of it, it didn't cause a problem. Since he has had the diarrhea problem I have been able to keep it two a minimum by feeding him dry food. My suspicion is that the dry food just doesn't have the same amount of ingredients and, something, in the ingredients is causing the problem.  Currently he has like 1 day of diarrhea for every 6 that is normal.

But this week I stared giving him more wet food and again, he had a bit of diarrhea.

So my question... if your cat is having diarrhea issues do you fee it wet food. If your cat doesn't have this as an issue... do you feed it dry?

Additionally, since giving him dry food, I have to say his "asthma" or coughing is not as bad. I cut back on his steroid dose and no coughing at all.

I heard a theory once that asthma or cat COPD is caused by inflammation in the digestive track. That it spreads to the respiratory system. And, if you get the digestive track under control the asthma will resolve.

Maybe you changed the diet too fast?

My former foster cat (she is my own cat now), was used to dry food.

I decided to give her some wet food as well. At first, she got diarrhea. But after given wet food a couple of times (only once a day, I gave it as an extra, she got dry food too), it was over. I think they have to get used to it.

But I don't know exactly why your cat keeps having diarrhea. Is it possible to combine this with some dry food? And did you try different brands with different ingredients? I would recommend a wet food with a high level of meat, like Bozita or Almo Nature. Or raw food of course, if your cat likes this.

I don't know. It is strange he went for a long period with the wet food -- and was ok.  But now he isn't.

Though I haven't had him checked out, I did have a full physical with blood tests in April and all was normal. It seems to strange that he would have issues almost immediately afterward but the only thing that changed was the food.  Yet, it wasn't the KIND of food... it was only quantity.