What’s the dog going to think about the human he loves the most burning in eternal torment, since that is where most human beings end up?
Same as everyone else... “you did it to yourself, buster”
Presuming dogs go to Heaven at death, then as with humans, these will see the justice of it, and how they loved darkness over light, and rejected obeying the light they had, which if obeyed, would had led them to the Light, spurning their day of grace.
And that the eternal life has its corollary in eternal punishment, yet that their punishment is corespondent to their accountability in the light of the grace they were given,
And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God. (John 3:19-21)
While ye have light, believe in the light, that ye may be the children of light. These things spake Jesus, and departed, and did hide himself from them. (John 12:36)
And that servant, which knew his lord's will, and prepared not himself, neither did according to his will, shall be beaten with many stripes. But he that knew not, and did commit things worthy of stripes, shall be beaten with few stripes. For unto whomsoever much is given, of him shall be much required: and to whom men have committed much, of him they will ask the more. (Luke 12:47-48)
And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works. (Revelation 20:12)