schema.prisma

model Owner {
  id    Int    @id @default(autoincrement())
  name  String
  dogs  Dog[]
}

model Dog {
  id       Int    @id @default(autoincrement())
  name     String
  age      Int    @default(1)
  ownerId  Int
  owner    Owner  @relation(fields: [ownerId], references: [id])
}