My dog's poop is yellow after milk thistle. Should I worry?

Shades of stool color can vary widely from day to day, hour to hour, or (as you experienced) within the same bowel movement. Typically, diet and supplements are the main sources of changes in stool color, so the supplement that you're using may be to blame. The color of the supplement or food are less to blame for the color change than the way some of the vitamins and minerals digest. Regardless, since Chispas is still eating and acting normally, there's no cause for concern. Shades of brown in stool are all normal. However, colors like black, red, or white stool are all signs that something is amiss. Based on what you've described, I don't think you need to be concerned in the slightest!

I can see that some of this stool looks a little yellow and that there might be some foreign material, but otherwise it looks formed and I don't see anything concerning like blood or mucous. As long as Bo isn't straining to defecate, vomiting or not eating as well I wouldn't be concerned about his stool. The makeup probably isn't to blame since I would expect you to see changes a day or two after it was ingested, not a week later.

I wouldn’t be worried about the color of kiwi s stool at all. The color can vary significantly, especially when new foods and treats are added. If she starts straining while having a bowel movement, or if she develops a poor appetite, diarrhea or weight loss then I would have her evaluated by her veterinarian. I love her name!! Please let us know if you have additional questions.

Changes in stool color can happen, especially if there was a change in the diet. I would not be concerned about a one-time color change if Peggy Sue is otherwise normal. If she has a poor appetite, vomiting, or diarrhea, then she should get checked out by a vet.

While the stool looks dark it does not look black and I think the color is a variation of normal. I think the other things look like millet bird seed or some other kind of plant material - it doesn’t look like any kind of parasite. I wouldn’t be concerned unless Aura develops diarrhea or is having trouble defecating.

A change in food can sometimes cause the stool to change color slightly or become loser, however you did mention it was the same food, just a new bag. Checking to see if there were any ingredient changes between bags may alert you to a cause. A bland meal of boiled rice and chicken may also help with any minor GI upset while transitioning food. Other issues can include GI upset, parasites, illness, food allergies, etc, so if the problem does not resolve bringing in Joey along with a stool sample to your vet can help rule out some of these other issues and narrow down the cause.

The good news is that these yellow dots don't look like any intestinal parasite that's visible with the naked eye. My best guess is that your dog recently ate something relatively fibrous, like plant material, rice, or another vegetable that passed through the stool reasonably unchanged. As long as your dog isn't experiencing any changes in their appetite or energy level, or any vomiting, then I don't see any cause for concern. If this continues, you can always ask your vet to submit a stool sample to a reference lab for further evaluation.