It's not that uncommon that bulldogs throw up, if he's acting normal, poops, pees, drinks and eats I don't think you need to worry Just keep an eye on him if he should throw up again or have loose poop. There can be so many reasons for them puking. Two of mine throw up if their tummies are empty so I have to make sure they eat twice a day at least, and Joey sometimes throws up if she drinks to much water. It can also be that they were to active after food, it's important to keep them calm after meals to prevent twisted intestine.
If my dogs throw up I normally give them chicken and rice for a couple of days to help their tummy.
Hope George is doing well still <3