They likely see us as gods, or how humans would see elves and their comparatively long lifespans.

A human could live a life having many dogs as companions, but from a dog's perspective their human would be there from birth up until their pup's births, and then death. Seemingly timeless until eventually one dog will see their master growing old and grey like them, and then both dying around the same time.

I read a story from a dog's perspective on this very topic, if I can find it I'll post it in the replies below.