My dogs never get a lot of bread, but they do get some...not Panettone bread, tho, and I make most of my bread.
When I was a kid, a med-sized dog, Princess, ate 3 loaves of bread dough that had just thawed but not risen. She was very 'drunk' and uncomfortable when it started rising in her belly. My parents took turns all night walking her around in the house, and outside, to keep her awake and moving around. She came thru it fine, but mom was extra careful when thawing the 3-packs of frozen bread dough. There was no such thing as an emergency vet back then, so maybe she was just super lucky. She would eat anything...ate half a can from a can of peas once, too...looked like it'd been shot up until half blew off. Great dog, tho.
I hope Petey is okay. All our best for his recovery.