It is common for stool to be a little softer during a food transition, especially in the early days. That does not necessarily mean something is wrong.
If your dog's stool becomes too soft, slow the transition down and repeat the previous step for a little longer before increasing the percentage of Sundays again.
A very dark brown stool can still be normal. But if your dog's stool is truly black, sticky, or accompanied by other signs of illness, contact your veterinarian promptly.
To learn more about how to assess your dog’s stool, check out Dr. Tory’s article.
