Why is my dog throwing up yellow liquid after deworming?

Question

Lucky is throwing up yellow liquid every few hours since yesterday. He is not eating or drinking. He threw up worms twice yesterday, but now I can't see any more worms in his vomit. I gave him Zentel for the worms a few hours ago. Should I have seen any improvement by now? Is the vomiting because of the worms? Is it likely to stop now? Very worried. Please help. Thanks. Pet's info: Cat | Mixed Breed | Male | unneutered | 9 months and 12 days old

Dr. Melanie, BVSc MS · Accepted Answer

You are correct that the vomiting could be due to the worms, but deworming treatments can also cause vomiting as a side effect. It's serious that he isn't eating or drinking. When a cat stop eating and drinking, it is time to see the vet as Lucky could get dehydrated quickly. I would have Lucky seen by a vet now who can treat his symptoms.

Why is my dog throwing up yellow liquid after deworming?

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