Why Is My Boxer Eating Grass and Vomiting? (Vet Answered)

ℹ️Meredith asks about their dog, Duke (Boxer)
🗓️Asked on 2 December 2025
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This question has been answered by a vet

Dr. Karyn Kanowski
Dr. Karyn Kanowski BVSc, MRCVS

Small Animal Veterinarian

Dr. Karyn is a small animal veterinarian originally from Australia, now based in the UK. She holds degrees in Veterinary Science (2010) and Zoology. When not helping pets, she tends to her 5 cats, 5 dogs, and garden!

The Question

Duke has started frantically eating grass every time we go outside, to the point where he's pulling me toward any patch of lawn he sees. He then vomits yellow foam about 30 minutes later. This has been happening every morning for the past week. Could this be acid reflux or something wrong with his stomach?

Quick Info about Duke

Age: 5 years
Sex: Male
Neutered/Spayed: Yes
Breed: Boxer
Weight: 70 lbs
Location: United States
Dr. Karyn Kanowski
Dr. Karyn replied on 7 December 2025

📹 Vet's Video Reply (scroll down to see text answer)

Hi Meredith, I think you’re onto something there. What you’re describing makes me very suspicious of acid reflux, particularly as you’ve cut Duke’s feeds from twice daily to just once. This means that for around 22 hours per day, his stomach is empty, with stomach acids building up with nothing to absorb them. Although some dogs do only get fed once per day, I recommend two meals at least, particularly for a dog that is used to being fed twice daily. Of course, there are lots of other reasons why dogs might eat grass a vomit, such as inflammatory bowel disease, food sensitivities, or more worrying causes too, so if this vomiting persists, we definitely need to get Duke seen by his vet for a physical examination. I’ve included some links below for some more information on vomiting and gastrointestinal problems. Provided he is eating well and seeming well in himself, the first thing you need to do is go back to twice daily feeding, and just reduce the overall amount of food he’s having each day rather than cutting out a whole meal. If you don’t see an improvement within a few days, then I would recommend making an appointment with your vet. If you want to talk one-on-one to a vet at any stage, you can go to PangoVet.com and book an online appointment with one of the vets to talk about Duke from the comfort of home. Hopefully, things will settle down as soon as Duke starts having two meals a day again. All the best, Dr Karyn https://www.dogster.com/ask-the-vet/diarrhea-vomiting-in-dogs https://www.dogster.com/dog-behavior/why-is-my-dog-eating-grass https://www.dogster.com/dog-nutrition/dog-food-sensitivity https://www.dogster.com/dog-health-care/inflammatory-bowel-disease-ibd-in-dogs-vet-answer

Disclaimer: The advice provided here is for informational purposes only and does not constitute a medical diagnosis. Always consult your local vet for emergencies.
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