I only mix hard and soft on occasion as a "treat" you know. I found that feeding them like that on a regular, will definately change their "stool"... and my DH wasnt liking it either. We feed Meka Chicken Soup for the Puppy Lovers Soul & she loves it. If the food your feeding your pup as any corn or other fillers than you should think of changing it... Innova, Timberwolf & Canidea are brands some members use... Search the different forums for others who've wrote about this... Then you'll be able to see the feedback they got... Hope this helps and congrats on your pup