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My 9-week puppy has diarrhea and vomiting after new food. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Australian Shepherd - miniature | Female | unspayed | 1 month and 26 days old | 7 lbs

My new mini Australia Shepard, she is 9 weeks. She has had diarrhea the past 3 days. She only threw up 2 times in the past 3 days. Her nose is dry. Sometimes it’s cold and moist. She is eating normally and drinking water. When we first got her she had 1 bowl of her new food and that’s when she started getting diarrhea. When then started mixing in her old food from her previous owner. She still have really water based pooped. We saw some redness in there. We couldn’t tell if it was red.

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on December 22nd, 2018

Diarrhea and throwing up can be caused by a food sensitivity, dietary indiscretion, intestinal parasites, an intestinal blockage, bacterial infection, viral infection, the weather, food change, stress, etc.  I would fast Daisy for 24 hours and then put her on bland food for two days, such as boiled white rice and boiled white boneless chicken meat, fed in small quantities over several feeds and then transition back to regular food slowly over a few days. If this does not clear up the diarrhea or if the vomiting increases, or if your dog gets lethargic, she needs to see a veterinarian for an exam as there may be something more serious such as an infection going on.

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