No dirty dogs shall ever trample upon that golden pavement!

(Thomas Brooks, "The Crown and Glory of Christianity, or, HOLINESS, the Only Way to Happiness", 1662)

Throughout the Scriptures unholy people are branded, to their everlasting contempt—with the worst appellations. They are the most dangerous, and the most harmful beings in the world, and therefore are emblemized . . .
  by lions—for they are cruel, Psalm 22:21;
  by bears—for they are savage, Isaiah 11:7;
  by dragons—for they are hideous, Ezekiel 29:3;
  by wolves—for they are ravenous, Ezekiel 22:27;
  by dogs—for they are snarling, Revelation 22:15;
  by vipers and scorpions—for they are stinging, Matthew 12:34, Ezekiel 2:6;
  by spiders and cockatrices—for they are poisoning, Isaiah 59:5;
  by swine—for they are intemperate, Matthew 7:6.

Remember this: that all these stinging expressions and appellations which disgrace and vilify unholy people, were inspired by the Holy Spirit and published in His holy Word.

The glutton is depicted as a swine;
the fraudulent person is depicted as a fox;
the lustful person is depicted as a goat;
the backbiter is depicted as a barking cur;
the slanderer is depicted as an asp;
the oppressor is depicted as a wolf;
the persecutor is depicted as a tiger;
the seducer is depicted as a serpent.

Do you think that God admit such vermin as unholy people are—to eternally inhabit His holy Heaven? Surely not! God has long since resolved upon it—that no unclean beasts shall enter into Heaven—that no dirty dogs shall ever trample upon that golden pavement! Certainly God will not allow such beasts and toads and snakes and serpents—to forever live with Him! Heaven is a too holy place to admit such vermin to inhabit!

"Nothing impure will ever enter it." Revelation 21:27

"Outside are the dogs, those who practice magic arts, the sexually immoral, the murderers, the idolaters and everyone who loves and practices falsehood." Revelation 22:15

All in Heaven are holy: the angels holy, the saints are holy—and the Lord Himself above all is most glorious in holiness.

Now certainly it would be a Hell to these holy ones to have unholy wretches to be their eternal companions! When the holy angels fell from their holiness—Heaven was so holy that it spewed them out! Certainly there will be no room in Heaven for such filthy beasts as unholy people are! 'Jerusalem above' is too glorious a habitation for beasts—or for men of beastly spirits, or beastly principles, or beastly practices. The city of the great God was never built for beasts. A wilderness and not a paradise—is fittest for beasts.