Hi Brian, please contact your Vet with some urgency. Your Lab eating a large amount of food like this could easily cause “bloat” (Gastric Torsion) where the intestines twist on themselves. This condition is fatal if not dealt with quickly.

If your dog is trying to vomit and bringing nothing up could be a sign of it, he will of course be bloated having eaten all that food. Please do take him to your Vet and get a professional opinion on his condition.

I do.hope he is alright….good luck.