Why are both my dogs sick with diarrhea and mucus in their stool?

Question

Bella sick with diarrhea 3 weeks ago. After treatment stool returned to normal. Two weeks after Bella was sick, Pepper developed diarrhea. Both were given bland and metro. Pepper stool not returning to normal, has few BM's. Most recent was formed but covered in mucus. Bella is now having very thick/firm mucus on stool. Bella fecal at lab negative for parasites. Any clue what could be causing both to be sick and one have poor stool still and the other have symptoms return even with metro? Pet's info: Dog | Yorkshire Terrier | Female | spayed | 9 years and 11 months old | 3.6 lbs

Kevin Sanada, DVM · Accepted Answer

It definitely seems like an infection was the initial cause of the diarrhea and was well-controlled with the metronidazole. Anytime we treat for infection, we change the environment of the gut flora and it's not unusual for it to take some time for things to get back to normal after the antibiotics have been discontinued. It's also possible for the infection to return if not treated for long enough, or if the most appropriate antibiotic was not used. An increase in mucous tells me that there are issues within the colon where most fermentation by normal gut bacteria takes place. If the stools are still somewhat normal appearing (besides the excess mucous) and Giardia has been ruled-out as a cause, then I would wait a few days to see if things return to normal. You may consider adding probiotics to their diet if also advised by your veterinarian. I hope this helps and Bella and Pepper get better soon.

Why are both my dogs sick with diarrhea and mucus in their stool?

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