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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
This shouldn't be a problem. The hydrocodone can cause some lethargy and GI upset, but it's well tolerated in dogs.
The Tylenol can also lead to some mild GI upset, but it's not high enough to cause liver toxicity or red blood cell toxicity.
I hope this helps, let me know if you have any other questions.