Pedigree has a good deal of corn in it and many of the bull breeds do not do well on corn.
You might want to try a food like California Natural Lamb or Canidae (see www.canidae.com for dealers) and see if he does better with one of them.
Eagle, Wellness, Natural choice and many more good foods out there in pet supply stores but skip any with wheat or corn in them and see if that works.
Do have the stool checked for parasites too - they can also cause diarrhea.
Hope this helps you!
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