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No, it will not hurt him and is not considered toxic to cats.
He could develop an upset stomach from eating something new.
If that happens give him 1/4 of a 10mg Pepcid ac tablet which is a human over the counter stomach acid reducer. It can be given every 12 hours as needed.
Putting him on a bland diet of plain cooked chicken or plain cooked ground turkey can be easier to digest. If he does not have any signs then you do not need to do anything out of the ordinary.
The Benadryl could make him sleepy or agitated. Sometimes a higher dose, which he had, can cause agitation.
I would not expect emergency signs as he did not consume a toxic dose of anything.
Signs he needs to see the vet are: Not eating for 24 hours, not drinking for 12 hours, unable to keep food or water down for 24 hours, blood in the vomit or stool, repeated watery diarrhea, so lethargic that will not get up.
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