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Why are my 1-month-old Rottweiler puppies vomiting mucus after eating?

Updated On September 23rd, 2025

Pet's info: Dog | Rottweiler | Male | unneutered | 1 month and 1 day old | 6 lbs

I have two Rottweiler puppies turned one month old yesterday from day one we have been having a hard go, four days ago they started vomiting mucus hours after eating

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Answered By David Darvishian

Veterinarian

Published on November 15th, 2017

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear about Gus and Gab. I always tell clients that if any abnormal sign persists, worsens, or other signs develop, it's time to see your veterinarian. The problems with vomiting are fluid/electrolyte losses, lethargy, weakness, shock, and even death. Vomiting has many causes including intestinal worms, inflammation, infection, dietary problems (including dietary indiscretion or eating things pets are not supposed to eat, food sensitivities/allergies), ingestion of foreign bodies or exposure to toxins, bacterial overgrowth in the gut, problems in the stomach, intestines, or even problems outside of the intestinal tract/stomach including pancreatitis, kidney/liver problems, metabolic disease (diabetes,etc), endocrine diseases (thyroid or other hormone problems), etc. Usually, in puppies, we worry about intestinal parasites, infection, foreign body ingestion or dietary indiscretion. A thorough history and physical exam with resultant diagnostics such as fecal tests, blood tests, imaging studies such as x-rays/ultrasound can be done to try to determine what is going on. Since they are both vomiting, I would venture to guess that they are having intestinal worm issues. Puppies should be dewormed starting at 2 weeks of age and then every 2-3 weeks. This should be done multiple times and should continue for 3-4 times after weaning. When puppies nurse, they continue to get infected with intestinal parasites from their mother. Good luck

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