Albert Barnes on Revelation 22:15

For without are dogs. The wicked, the depraved, the vile: for of such characters the dogs, an unclean animal among the Jews, was regarded as a symbol, De 23:18. On the meaning of the expression, Php 3:2. The word "without" means that they would not be admitted into the heavenly city, the New Jerusalem, Rev 21:8, 27.

And sorcerers, etc. All these characters are specified in Rev 21:8, as excluded from heaven. Rev 21:8. The only change is, that those who "love and make a lie" are added to the list; that is, who delight in lies, or that which is false.

(g) "without" Rev 21:8,27 (h) "dogs" Php 3:2 (i) "the root" Rev 5:5