BluCrystal is absolutely correct. You need to get him to a vet NOW. I wouldn't even wait until tomorrow, I would go to an emergency vet TONIGHT because if part of the toy is somehow wrapped around something internally, waiting until tomorrow could be too late. He could also have a blockage from part of the toy getting lodged at the opening where the stomach empties into the small intestine. Please don't delay. Let us know what the vet says.
Ghilly
Go to the vet asap. Stuffing can become stringy in the abdomen and cause severe digestive problems, including death if not treated.