Adding moisture to the diet would help soften the stool. If he is eating dry kibble, either change to canned or gradually work up to 50:50 dry and canned food. If you’re feeding canned food and the stool is still too hard, you could try adding a small amount of liver to the diet. That softens the stool and is extremely beneficial in other ways!
Dogs are not really built to eat a much plant fiber. However, if you wanted to add psyllium husk (Metamucil) this acts as fiber and is relatively innocuous. I agree with Naturella’s comments about adding probiotics and enzymes :).
Tabitha Thompson, DVM CVA
http://naturalalternativesvet.com
