I have been feeding my dog wellness wet turkey and sweet potato food for two years now since I adopted her, the small can as my girl is only 12 pounds. She has been fine on it and enjoys it. Last month I noticed she had colitis a couple of times without any dietary changes. I as not nice as it sounds, went thru her poop with tooth picks to see if she had eaten anything outside perhaps and didn't see anything big but did see whites specks of  something in her poop as you can see by the pictures (sorry gross I know but clearly they are visible to the naked eye).