My 13-week-old puppy has soft stool and pink mucous. What's wrong?
Updated on September 23rd, 2025
Pet's info: Dog | Mixed Breed | Male | unneutered | 12 lbs
Hi! I have a 13 week old puppy and today noticed his stools were soft with some pink tinged mucous. The last stool had increased mucous. He is eating, drinking, and acting/playing normally. I'm not sure if it's worms or if he maybe got into something in the yard.
I wouldn't be worried about one stool like this, but if it worsens or there is any vomiting, disinterest in food, or lethargy, that would warrant an emergency exam for a pup his age. Parvovirus is of serious concern if he is not fully vaccinated.
If his stools remain soft but he is otherwise well, I'd recommend calling your regular veterinarian. They may recommend an exam or prescribe probiotics or a diet change if they have already seen Cliff. Puppies his age are generally dewormed every two weeks to eliminate all the life cycles of the most common parasites.
I hope this is helpful. Thanks for using Petco Pet Education Center, formerly Petcoach.