Welcome! I am Dr. Altman, a licensed veterinarian and I am happy to answer your questions.
As long as they are without the pit you should be alright but the quantity ingested might cause some gi upset including diarrhea, reduced appetite, perhaps even vomiting but they are not toxic
For his next meal you might want to reduce the quantity by 50% and add in some white rice to reduce the risk of diarrhea and settle his stomach a little bit
Please let me know if you have any additional questions I can assist with today
But luckily dates are not toxic to your Lab and he should be just fine in a few days...
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