Bimbo is Tito's nurse, mom, dad, care taker in general. He sleeps with Tito, and goes out to get food for him because Tito can't see.
Tito has a dog, named Bimbo.
The earth starts the tremble, at first the people of Pompeii didn't think much about it. However, Bimbo did. Tito didn't think much about, Bimbo ignored it. They went on with their day walking through Pompeii.