Thanks for using Just Answer. My name is Rebecca. I am a veterinarian and will do my best to help.
It has not been specifically tested in dogs, but in people these should not be given together, so it is probably best not to give them together in dogs. Since both drugs can affect the metabolism of serotonin, both together could cause the levels of serotonin to be too high. You could see nausea, vomiting, or possibly cardiovascular collapse. Again, this data is from people, but concerning enough to recommend not giving these together. A single day or so of getting both would probably do no harm; these things would probably happen over time.
Let me know if this answers your question and if I can help with anything else.
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I am so sorry. My sincere condolences. Thank you for letting me know, and thank you for the great rating.