Hi Reese B-
I just recently switched my dogs from a chicken recipe to beef. The difference in the color of their poop was drastic. Along with the hot sun darkening them up, I was a little concerned too. Considering both dogs changed and it was consistent with the food rotation, I didn’t worry too much. Also, there doesn’t seem to be any change in their behavior or health. But, if you are really concerned, like Anon mentioned, you could always take a sample to the vet.
Also, I found a site where it was recommended to put a fresh “sample” on a white absorbent paper towel and see if there is any red that seeps from it. Here is the link: https://pethelpful.com/dogs/Causes-of-blood-in-a-dogs-stool
Hope this helps!
