We can enter through the gates, but our pets can't?
Rev 22:14 Blessed [are] they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.
Rev 22:15 For without [are] dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and whosoever loveth and maketh a lie.
"dogs" in this verse is a statement of degradation… it is referring to "male prostitutes"
Animals in Heaven:
Isa 65:25 The wolf and the lamb shall feed together, and the lion shall eat straw like the bullock: and dust [shall be] the serpent’s meat. They shall not hurt nor destroy in all my holy mountain, saith the LORD.