I would try feeding the Innova alone and not mixed at this point. If the bloody stools exist after he has been eating Innova alone, time for another switch. Small dogs tend to have more sensitive stomachs.....I wouldn't worry, this is very normal. I tried a couple of foods before I hit on Innova! I now have a litter of puppies. Two little boys! They will started on Innova as soon as they are weaned. These puppies will be sold, however, I will be sending a weeks worth of food with them to their new homes!! They won't be leaving me til around 12 weeks of age. (here long enough for me to start spoiling the sweet little guys!)
WWW.charmedyorkies.com