I often chop/grind raw vegetables (carrots, cellary, cabbage - not all at the same time) into his dry Kibble, this adds moisture and fiber - I also give some cooked (canned) black beans and water in the
Kibble. His bowel movements seem to benefit from this extra effort at providing a fiber rich
diet. Most of these vegetable cost less than quality dog food, and often these vegetables are from left overs we'd be throwing away if we didn't feed them to the dog..