Questions & Answers about Su perro come mis zapatos.
Why does the sentence use mis instead of mi?
Does su specifically mean "his"?
Not exactly! Su is a very flexible word that can mean his, her, its, your (formal you), or their. We only know it means "his" here because of the English translation. In real life, context makes it clear who the dog belongs to.
If the dog belonged to multiple people (their dog), would we use sus perro?