Hi Liya O,
I think DogFoodie might have forgotten to link a copy of the body conditioning chart. Here’s a link to it:
https://www.purinaveterinarydiets.com/media/1209/body_condition_chart.pdf
I don’t know how long you’ve had him, but there generally is a transition time for the dog to adapt to the food, especially if he was eating a lower quality diet. I foster a lot of dogs and they need to be transitioned to better foods. It could also be that you are feeding him too much food. I have a small dog that’s about the size of yours and I feed her slightly less than recommended on the food bags, depending on the calorie count of the food. The other possibility is that there is an intolerance to the protein in the food you are feeding.
Just to add some other possibilites, since you don’t know his history, you might want to run a complete fecal check on him that’s sent out to a lab. He could possibly have some parasites conritubuting to the stool problem.
