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My dog threw up moss, now twitching and not eating. What's wrong?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 4 years and 11 months old | 90 lbs

Our dog threw up moss on Tuesday and today he is twitching like muscle spasms. He also is only eating dinner (vs. two meals a day). I don't know if he ate anything else. Otherwise, his behavior seems normal. He is playing with our other dog and when he eats dinner, he seems normal. He seems happy with tail wagging. Any ideas on what could be the problem?

1 Answer

Most Helpful Answer

Christie Long, DVM

Answered By Christie Long, DVM

Veterinarian, Certified Veterinary Acupuncturist

Published on December 14th, 2017

I don't have a definitive answer, but certainly if there was moss in the vomit on Tuesday I would be concerned that Thunder had ingested some type of plant that is making him sick at this point. He sounds mildly inappetant - with missing only breakfast - which is a bit worrisome, but it's the muscle twitching that's really bothering me. I would be concerned that he could have ingested a plant that's neurotoxic (i.e. affects the nervous system) and the spasms are caused by that.

Hopefully it's not too serious, but the fact that the symptoms started more than 48 hours ago and are not getting better would make me want to get this checked out ASAP. Poisonous plants can can liver damage, and even though the liver will repair itself patients often need supportive care - such as IV fluids - in order to get back to normal. I'd recommend getting him checked today, running some blood work, and considering a brief period of hospitalization to get him back to normal.
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