Sorry to hear Buddy is unwell. I love choc. labs. my daughter and grand kids have one. Chicken and rice is good to give, and a tablespoon of plain bio yoghurt mixed in works wonders. However if he is still like it by Monday I would ring the vets for advise. Hope he is better soon.
Chris

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A DOG MAY OUTGROW YOUR LAP,
BUT NEVER YOUR HEART.