CHeryl,
The transit time (food to poo) can be anywhere between 12 hours (unless blowout diarrhea) and 72 hours!!) it all depends on the dog. the way we "unscientifically"

test this is to chop up a raw carrot... put some in 1 meal. watch all the poops afterwards and record how many hours after the carrot included meal before you see those carrot chunks show up in the poo....... this is how you can tell what YOUR dog's transit time is (at this particular time frame)....
When trying to figure out what is going on with an EPI dog... pick one "method" at a time.... and i like to go with the easiest method first... you want to be consistent in what you are doing a trial on.
You need to decide of you are going to try testing the food or the CREON dose or the CREON application....
1. Since you are cutting out the fish (you have already started testing the food... so continue with this).. and give the SAME amount of CREON you were giving. try the fish elimination for about 3 days. and record the results. (do the carrot trick so you have a better understanding of the transit time).
2. if no change THEN try the exact same meal (no fish), but open up 1 +1/4 CREON capsules and sprinkle on the food. this you only need to try for 2 days and if there is a change you will notice fairly quickly.
3. DEpending on what the results are.... PLEASE LET US KNOW.... then we can help you to decide what the next steps should be............. either test to see if maybe it is the Taste of the Wild that doesn't agree.... OR..... if it is the Roo that doesn't agree..... OR..... if you need to try giving 1+1/2 CREON.... OR..... i
It's all about trying process and elimination... BUT you need to be consistent and then you need to proof it..
Afterall.... it most likely is that this is SID getting out of control... but you need to try things one at a time to figure out the underlying cause...................and we'll help you as best we can

Olesia, was owned by Izzy, a 35lb Spanish Water Dog (SWD), Diagnosed at 1.5 years old - TLI results 1.. Izzy passed away on February 13, 2020 at 15 years old. She lived with EPI for 13+1/2 years. It was because of Izzy that Epi4Dogs was started... she was the inspiration. May her legacy of helping others with EPI continue for as long as needed.........