Albert Barnes on Matthew 15:27

And she said, Truth, Lord, etc: "What you say is true. Let it be that the best food should he given to the children. Let the Jews have the chief benefit of thy ministry. But the dogs, beneath the table, eat the crumbs. So let me be regarded as a dog, a heathen, as unworthy of everything. Yet grant one exertion of that almighty power, displayed so signally among the Jews, and heal the despised daughter of a despised heathen mother."