When dogs die they just go to sleep permanently and never wake up or are conscious ever again.
Then the dog is either cremated, buried or thrown in the trash can to dispose of the body and then if the dog is buried or thrown in the trash the bodies of the dog eventually decays to the bones.
Now for those people that believe in god and heaven supposedly the dogs go to a heaven for dogs but if that were the case then you would not be able to see your dog anymore even when you die and reached heaven.
Personally I'm no believe in god or an afterlife or heaven for humans or heaven for dogs, cats etc.
What I believe happens to dogs and everybody when they die is just that we cease to exist and are no longer able to see anything or be conscious anymore.
Things just go back to where they were before we ever existed.