After being on Nutro Essentials for a few years my chihuahua started having stools that were yellow and soft. I switched her over to Merrick Healthy Grains. No problems for a few months but it’s starting to happen again. Her fecal tests came back negative and we were given microflora to add to her kibbles. It seemed to help a lot. Her stools were a normal brown color. After being off of it her stools stayed consistent. But just these last few weeks it’s been irregular and they are lighter in color again. In the mornings they come out normal log shaped, throughout the day they get progressively softer to the point where it’s harder to pick up. Especially the one right before bed. The first stool is on the left and the second one on the right. Or is this normal?