My older pug has diarrhea with mucus and bright red blood. Vet?
Hello and welcome to Petco Pet Education Center, formerly Petcoach. Diarrhea with mucous like that is concerning for either a mild GI upset, or could be caused by a more severe problem such as IBD or cancer. The small bits of blood could just be a bit of colitis (inflammed colon) and some burst vessels, or could be due to a clotting disease or a tumor (the last two much less likely). If Louie is still eating, drinking, playing and acting normally, then you can monitor for now and if the blood or diarrhea gets worse then bring him to a vet. If you see any other signs such as weakness, vomiting, inappetance, trouble breathing, or more blood, then get Louie to a vet right away.
One possible cause as well is rat bait toxicity, so if there is ANY chance Louie could have gotten into rat bait then I would have him checked by a vet right away.
Overall, it is likely not a concern, however monitor closely and bring him to a vet if you see any decline.
Best of luck with Louie!
Updated on September 23rd, 2025